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PLOT Statement

PLOT (analysis-variables)*group-variable <(block-variables ) > < =symbol-variable > < / options >;

analysis-variables

identify one or more variables to be analyzed. An analysis variable is required. If you specify more than one analysis variable, enclose the list in parentheses. For example, the following statements request distinct box plots for the variables weight, length, and width:

   proc boxplot data=summary;
      plot (weight length width)*day;
   run;

group-variable

specifies the variable that identifies groups in the data. The group variable is required. In the preceding PLOT statement, day is the group variable.

block-variables

specify optional variables that group the data into blocks of consecutive groups. These blocks are labeled in a legend, and each block variable provides one level of labels in the legend.

symbol-variable

specifies an optional variable whose levels (unique values) determine the symbol marker used to plot the means. Distinct symbol markers are displayed for points corresponding to the various levels of the symbol variable. You can specify the symbol markers with SYMBOLn statements (refer to SAS/GRAPH Software: Reference for complete details).

options

enhance the appearance of the box plot, request additional analyses, save results in data sets, and so on. Complete descriptions for each option follow.

ANNOTATE=SAS-data-set

specifies an ANNOTATE= type data set, as described in SAS/GRAPH Software: Reference.

BLOCKLABELPOS=ABOVE | LEFT

specifies the position of a block variable label in the block legend. The keyword ABOVE places the label immediately above the legend, and LEFT places the label to the left of the legend. Use the keyword LEFT with labels that are short enough to fit in the margin of the plot; otherwise, they are truncated. The default keyword is ABOVE.

BLOCKLABTYPE=SCALED | TRUNCATED

BLOCKLABTYPE=height

specifies how lengthy block variable values are to be treated when there is insufficient space to display them in the block legend. If you specify the BLOCKLABTYPE=SCALED option, the values are uniformly reduced in height so that they fit. If you specify the BLOCKLABTYPE=TRUNCATED option, lengthy values are truncated on the right until they fit. You can also specify a text height in vertical percent screen units for the values. By default, lengthy values are not displayed. For more information, see the section "Displaying Blocks of Data".

BLOCKPOS=n

specifies the vertical position of the legend for the values of the block variables. Values of n and the corresponding positions are as follows. By default, BLOCKPOS=1.

n	Legend Position
1	top of plot, offset from axis frame
2	top of plot, immediately above axis frame
3	bottom of plot, immediately above horizontal axis
4	bottom of plot, below horizontal axis label

BLOCKREP

specifies that block variable values for all groups are to be displayed. By default, only the first block variable value in any block is displayed, and repeated block variable values are not displayed.

BOXCONNECT

BOXCONNECT=MEAN | MEDIAN | MAX | MIN | Q1 | Q3

specifies that the points representing group means, medians, maximum values, minimum values, first quartiles, or third quartiles are to be connected with line segments. If the BOXCONNECT option is specified without a keyword identifying the points to be connected, group means are connected. By default, no points are connected.

BOXSTYLE=keyword

specifies the style of the box-and-whisker plots displayed. If you specify BOXSTYLE=SKELETAL, the whiskers are drawn from the edges of the box to the extreme values of the group. This plot is sometimes referred to as a skeletal box-and-whisker plot. By default, the whiskers are drawn with serifs: you can specify the NOSERIFS option to draw the whiskers without serifs.

In the following descriptions, the terms fence and far fence refer to the distance from the first and third quartiles (25th and 75th percentiles, respectively), expressed in terms of the interquartile range (IQR). For example, the lower fence is located at 1.5×IQR below the 25th percentile; the upper fence is located at 1.5×IQR above the 75th percentile. Similarly, the lower far fence is located at 3×IQR below the 25th percentile; the upper far fence is located at 3×IQR above the 75th percentile.

If you specify BOXSTYLE=SCHEMATIC, a whisker is drawn from the upper edge of the box to the largest value within the upper fence and from the lower edge of the box to the smallest value within the lower fence. Serifs are added to the whiskers by default. Observations outside the fences are identified with a special symbol; you can specify the shape and color for this symbol with the IDSYMBOL= and IDCOLOR= options. The default symbol is a square. This type of plot corresponds to the schematic box-and-whisker plot described in Chapter 2 of Tukey (1977). See Figure 18.4 and the discussion in the section "Styles of Box Plots" for more information.

If you specify BOXSTYLE=SCHEMATICID, a schematic box-and-whisker plot is displayed in which the value of the first variable listed in the ID statement is used to label the symbol marking each observation outside the upper and lower fences.

If you specify BOXSTYLE=SCHEMATICIDFAR, a schematic box-and-whisker plot is displayed in which the value of the first variable listed in the ID statement is used to label the symbol marking each observation outside the lower and upper far fences. Observations between the fences and the far fences are identified with a symbol but are not labeled with the ID variable.

Figure 18.2 illustrates the elements of a skeletal box-and-whisker plot.

BOXWIDTH=value

specifies the width (in horizontal percent screen units) of the box-and-whisker plots.

BOXWIDTHSCALE=value

specifies that the box-and-whisker plot width is to vary proportionately to a particular function of the group size n. The function is determined by the value.

If you specify a positive value, the widths are proportional to n^value. In particular, if you specify BOXWIDTHSCALE=1, the widths are proportional to the group size. If you specify BOXWIDTHSCALE=0.5, the widths are proportional to , as described by McGill, Tukey, and Larsen (1978). If you specify BOXWIDTHSCALE=0, the widths are proportional to log(n). See Example 18.4 for an illustration of the BOXWIDTHSCALE= option.

You can specify the BWSLEGEND option to display a legend identifying the function of n used to determine the box-and-whisker plot widths.

By default, the box widths are constant.

BWSLEGEND

displays a legend identifying the function of group size n specified with the BOXWIDTHSCALE= option. No legend is displayed if all group sizes are equal. The BWSLEGEND option is not applicable unless you also specify the BOXWIDTHSCALE= option.

CAXIS=color

CAXES=color

CA=color

specifies the color for the axes and tick marks. This option overrides any COLOR= specifications in an AXIS statement. The default value is the first color in the device color list.

CBLOCKLAB=color

specifies a fill color for the frame that encloses the block variable label in a block legend. By default, this area is not filled.

CBLOCKVAR=variable | (variable-list)

specifies variables whose values are colors for filling the background of the legend associated with block variables. Each CBLOCKVAR= variable must be a character variable of no more than eight characters in the input data set, and its values must be valid SAS/GRAPH color names (refer to SAS/GRAPH Software: Reference for complete details). A list of CBLOCKVAR= variables must be enclosed in parentheses.

The procedure matches the CBLOCKVAR= variables with block variables in the order specified. That is, each block legend is filled with the color value of the CBLOCKVAR= variable of the first observation in each block. In general, values of the ith CBLOCKVAR= variable are used to fill the block of the legend corresponding to the ith block variable.

By default, fill colors are not used for the block variable legend. The CBLOCKVAR= option is available only when block variables are used in the PLOT statement.

CBOXES=color

CBOXES=(variable)

specifies the colors for the outlines of the box-and-whisker plots created with the PLOT statement. You can use one of the following approaches:

• You can specify CBOXES=color to provide a single outline color for all the box-and-whisker plots.
• You can specify CBOXES=(variable) to provide a distinct outline color for each box-and-whisker plot as the value of the variable. The variable must be a character variable of length 8 or less in the input data set, and its values must be valid SAS/GRAPH color names (refer to SAS/GRAPH Software: Reference for complete details). The outline color of the plot displayed for a particular group is the value of the variable in the observations corresponding to this group. Note that, if there are multiple observations per group in the input data set, the values of the variable should be identical for all the observations in a given group.

The default color is the second color in the device color list.

CBOXFILL=color

CBOXFILL=(variable)

specifies the interior fill colors for the box-and-whisker plots. You can use one of the following approaches:

• You can specify CBOXFILL=color to provide a single color for all of the box-and-whisker plots.
• You can specify CBOXFILL=(variable) to provide a distinct color for each box-and-whisker plot as the value of the variable. The variable must be a character variable of length 8 or less in the input data set, and its values must be valid SAS/GRAPH color names (or the value EMPTY, which you can use to suppress color filling). Refer to SAS/GRAPH Software: Reference for complete details. The interior color of the box displayed for a particular group is the value of the variable in the observations corresponding to this group. Note that if there are multiple observations per group in the input data set, the values of the variable should be identical for all the observations in a given group.
  
  

By default, the interiors are not filled.

CCONNECT=color

specifies the color for the line segments connecting points on the plot. The default color is the color specified in the COLOR= option in the SYMBOL1 statement. This option is not applicable unless you also specify the BOXCONNECT option.

CFRAME=color

CFRAME=(color-list)

specifies the colors for filling the rectangle enclosed by the axes and the frame. By default, this area is not filled. The CFRAME= option cannot be used in conjunction with the NOFRAME option. You can specify a single color to fill the entire area.

CHREF=color

specifies the color for the lines requested by the option. The default value is the first color in the device color list.

CONTINUOUS

specifies that numeric group variable values are to be treated as continuous values. By default, the values of a numeric group variable are considered discrete values unless the HAXIS= option is specified. For more information, see the discussion in the section "Continuous Group Variables".

CTEXT=color

specifies the color for tick mark values and axis labels. The default color is the color specified in the CTEXT= option in the most recent GOPTIONS statement.

CVREF=color

specifies the color for the lines requested by the VREF= option. The default value is the first color in the device color list.

DESCRIPTION='string'

DES='string'

specifies a description of the box plot, not longer than 40 characters, that appears in the PROC GREPLAY master menu. The default string is the variable name.

ENDGRID

adds a grid to the rightmost portion of the plot, beginning with the first labeled major tick mark position that follows the box-and-whisker plot. You can use the HAXIS= option to force space to be added to the horizontal axis.

FONT=font

specifies a software font for labels and legends. You can also specify fonts for axis labels in an AXIS statement. The FONT= font takes precedence over the FTEXT= font specified in the GOPTIONS statement. Hardware characters are used by default. Refer to SAS/GRAPH Software: Reference for more information on the GOPTIONS statement.

GRID

adds a grid to the box plot. Grid lines are horizontal lines positioned at labeled major tick marks, and they cover the length and height of the plotting area.

HAXIS=values

HAXIS=AXISn

specifies tick mark values for the horizontal (group) axis. If the group variable is numeric, the values must be numeric and equally spaced. Optionally, you can specify an axis name defined in a previous AXIS statement. Refer to SAS/GRAPH Software: Reference for more information on the AXIS statement.

Specifying the HAXIS= option with a numeric group variable causes the group variable values to be treated as continuous values. For more information, see the description of the CONTINUOUS option and the discussion in the section "Continuous Group Variables". Numeric values can be given in an explicit or implicit list. If the group variable is character, values must be quoted strings of length 16 or less. If a date, time, or datetime format is associated with a numeric group variable, SAS datetime literals can be used. Examples of HAXIS= lists follow:

• haxis=0 2 4 6 8 10
• haxis=0 to 10 by 2
• haxis='LT12A' 'LT12B' 'LT12C' 'LT15A' 'LT15B' 'LT15C'
• haxis='20MAY88'D to '20AUG88'D by 7
• haxis='01JAN88'D to '31DEC88'D by 30

If the group variable is numeric, the HAXIS= list must span the group variable values, and if the group variable is character, the HAXIS= list must include all of the group variable values. You can add group positions to the box plot by specifying HAXIS= values that are not group variable values.

If you specify a large number of HAXIS= values, some of these may be thinned to avoid collisions between tick mark labels. To avoid thinning, use one of the following methods.

• Shorten values of the group variable by eliminating redundant characters. For example, if your group variable has values LOT1, LOT2, LOT3, and so on, you can use the SUBSTR function in a DATA step to eliminate LOT from each value, and you can modify the horizontal axis label to indicate that the values refer to lots.
• Use the TURNHLABELS option to turn the labels vertically.
• Use the NPANELPOS= option to force fewer group positions per panel.

HEIGHT=value

specifies the height (in vertical screen percent units) of the text for axis labels and legends. This value takes precedence over the HTEXT= value specified in the GOPTIONS statement. This option is recommended for use with software fonts specified with the FONT= option or with the FTEXT= option in the GOPTIONS statement. Refer to SAS/GRAPH Software: Reference for complete information on the GOPTIONS statement.

HMINOR=n

HM=n

specifies the number of minor tick marks between each major tick mark on the horizontal axis. Minor tick marks are not labeled. The default is HMINOR=0.

HOFFSET=value

specifies the length (in percent screen units) of the offset at both ends of the horizontal axis. You can eliminate the offset by specifying HOFFSET=0.

HREF=values

HREF=SAS-data-set

draws reference lines perpendicular to the horizontal (group) axis on the box plot. You can use this option in the following ways:

• You can specify the values for the lines with an HREF=list. If the group variable is numeric, the values must be numeric. If the group variable is character, the values must be quoted strings of up to 16 characters. If the group variable is formatted, the values must be given as internal values. Examples of HREF=values follow:
  
  

     HREF=5
     HREF=5 10 15 20 25 30
     HREF='Shift 1' 'Shift 2' 'Shift 3'
  

• You can specify reference line values as the values of a variable named _REF_ in an HREF=data set. The type and length of _REF_ must match those of the group variable specified in the PLOT statement. Optionally, you can provide labels for the lines as values of a variable named _REFLAB_, which must be a character variable of length 16 or less. If you want distinct reference lines to be displayed in plots for different analysis variables specified in the PLOT statement, you must include a character variable named _VAR_, whose values are the analysis variable names. If you do not include the variable _VAR_, all of the lines are displayed in all of the plots.
  
  Each observation in an HREF=data set corresponds to a reference line. If BY variables are used in the input data set, the same BY variable structure must be used in the reference line data set unless you specify the NOBYREF option.

Unless the CONTINUOUS or HAXIS= option is specified, numeric group variable values are treated as discrete values, and only HREF=values matching these discrete values are valid. Other values are ignored.

HREFLABELS='label₁' ... 'label_n'

HREFLABEL='label₁' ... 'label_n'

HREFLAB='label₁' ... 'label_n'

specifies labels for the reference lines requested by the HREF=option. The number of labels must equal the number of lines. Enclose each label in quotes. Labels can be up to 16 characters.

HREFLABPOS=n

specifies the vertical position of the HREFLABEL= label, as described in the following table. By default, n=2.

HREFLABPOS=	Label Position
1	along top of plot area
2	staggered from top to bottom of plot area
3	along bottom of plot area
4	staggered from bottom to top of plot area

IDCOLOR=color

specifies the color of the symbol marker used to identify outliers in schematic box-and-whisker plots (that is, when you also specify one of the following options: BOXSTYLE=SCHEMATIC, BOXSTYLE=SCHEMATICID, and BOXSTYLE=SCHEMATICIDFAR). The default color is the color specified with the CBOXES= option; otherwise, the second color in the device color list is used.

IDCTEXT=color

specifies the color for the text used to label outliers when you specify one of the keywords SCHEMATICID or SCHEMATICIDFAR with the BOXSTYLE= option. The default value is the color specified with the CTEXT= option.

IDFONT=font

specifies the font for the text used to label outliers when you specify one of the keywords SCHEMATICID or SCHEMATICIDFAR with the BOXSTYLE= option. The default font is SIMPLEX.

IDHEIGHT=value

specifies the height for the text used to label outliers when you specify one of the keywords SCHEMATICID or SCHEMATICIDFAR with the BOXSTYLE= option. The default value is the height specified with the HTEXT= option in the GOPTIONS statement. Refer to SAS/GRAPH Software: Reference for complete information on the GOPTIONS statement.

IDSYMBOL=symbol

specifies the symbol marker used to identify outliers in schematic box plots when you also specify one of the following options: BOXSTYLE=SCHEMATIC, BOXSTYLE=SCHEMATICID, and BOXSTYLE=SCHEMATICIDFAR. The default symbol is SQUARE.

INTERVAL=DAY | DTDAY | HOUR | MINUTE | MONTH | QTR | SECOND

specifies the natural time interval between consecutive group positions when a time, date, or datetime format is associated with a numeric group variable. By default, the INTERVAL= option uses the number of group positions per panel that you specify with the NPANELPOS= option. The default time interval keywords for various time formats are shown in the following table.

Format	Default Keyword	Format	Default Keyword
DATE	DAY	MONYY	MONTH
DATETIME	DTDAY	TIME	SECOND
DDMMYY	DAY	TOD	SECOND
HHMM	HOUR	WEEKDATE	DAY
HOUR	HOUR	WORDDATE	DAY
MMDDYY	DAY	YYMMDD	DAY
MMSS	MINUTE	YYQ	QTR

You can use the INTERVAL= option to modify the effect of the NPANELPOS= option, which specifies the number of group positions per panel (screen or page). The INTERVAL= option enables you to match the scale of the horizontal axis to the scale of the group variable without having to associate a different format with the group variable.

For example, suppose that your formatted group values span an overall time interval of 100 days and a DATETIME format is associated with the group variable. Since the default interval for the DATETIME format is DTDAY and since NPANELPOS=20 by default, the plot is displayed with two panels (screens or pages).

Now, suppose that your data span an overall time interval of 100 hours and a DATETIME format is associated with the group variable. The plot for these data is created in a single panel, but the data occupy only a small fraction of the plot since the scale of the data (hours) does not match that of the horizontal axis (days). If you specify INTERVAL=HOUR, the horizontal axis is scaled for 50 hours, matching the scale of the data, and the plot is displayed with two panels.

You should use the INTERVAL= option only in conjunction with the CONTINUOUS or HAXIS= option, which produces a horizontal axis of continuous group variable values. For more information, see the descriptions of the CONTINUOUS and HAXIS= options, and the discussion in the section "Continuous Group Variables".

LBOXES=linetype

LBOXES=(variable)

specifies the line types for the outlines of the box-and-whisker plots. You can use one of the following approaches:

• You can specify LBOXES=linetype to provide a single linetype for all of the box-and-whisker plots.
• You can specify LBOXES=(variable) to provide a distinct line type for each box-and-whisker plot. The variable must be a numeric variable in the input data set, and its values must be valid SAS/GRAPH linetype values (numbers ranging from 1 to 46). The line type for the plot displayed for a particular group is the value of the variable in the observations corresponding to this group. Note that if there are multiple observations per group in the input data set, the values of the variable should be identical for all of the observations in a given group.

The default value is 1, which produces solid lines. Refer to the description of the SYMBOL statement in SAS/GRAPH Software: Reference for more information on valid linetypes.

LENDGRID=n

specifies the line type for the grid requested with the ENDGRID option. The default value is n=1, which produces a solid line. If you use the LENDGRID= option, you do not need to specify the ENDGRID option. Refer to the description of the SYMBOL statement in SAS/GRAPH Software: Reference for more information on valid linetypes.

LGRID=n

specifies the line type for the grid requested with the GRID option. The default value is n=1, which produces a solid line. If you use the LGRID= option, you do not need to specify the GRID option. Refer to the description of the SYMBOL statement in SAS/GRAPH Software: Reference for more information on valid linetypes.

LHREF=linetype

LH=linetype

specifies the line type for reference lines requested with the HREF=option. The default value is 2, which produces a dashed line. Refer to the description of the SYMBOL statement in SAS/GRAPH Software: Reference for more information on valid linetypes.

LVREF=linetype

LV=linetype

specifies the line type for reference lines requested by the VREF= option. The default value is 2, which produces a dashed line. Refer to the description of the SYMBOL statement in SAS/GRAPH Software: Reference for more information on valid linetypes.

MAXPANELS=n

specifies the maximum number of pages or screens for a plot. By default, n=20.

MISSBREAK

determines how groups are formed when observations are read from a DATA= data set and a character group variable is provided. When you specify the MISSBREAK option, observations with missing values of the group variable are not processed. Furthermore, the next observation with a nonmissing value of the group variable is treated as the beginning observation of a new group even if this value is identical to the most recent nonmissing group value. In other words, by specifying the option MISSBREAK and by inserting an observation with a missing group variable value into a group of consecutive observations with the same group variable value, you can split the group into two distinct groups of observations.

By default (that is, when you omit the MISSBREAK option), observations with missing values of the group variable are not processed, and all remaining observations with the same consecutive value of the group variable are treated as a single group.

NAME='string'

specifies a name for the box plot, not more than 8 characters, that appears in the PROC GREPLAY master menu.

NLEGEND

requests a legend displaying group sample sizes. If the sample size is the same for each group, that number is displayed. Otherwise, the minimum and maximum group sample sizes are displayed.

NOBYREF

specifies that the reference line information in an HREF=or VREF= data set is to be applied uniformly to box plots created for all the BY groups in the input data set. If you specify the NOBYREF option, you do not need to provide BY variables in the reference line data set. By default, you must provide BY variables.

NOFRAME

suppresses the default frame drawn around the plot.

NOHLABEL

suppresses the label for the horizontal (group) axis. Use the NOHLABEL option when the meaning of the axis is evident from the tick mark labels, such as when a date format is associated with the group variable.

NOSERIFS

eliminates serifs from the whiskers of box-and-whisker plots.

NOTCHES

specifies that box-and-whisker plots are to be notched. The endpoints of the notches are located at the median plus and minus , where IQR is the interquartile range and n is the group sample size. The medians (central lines) of two box-and-whisker plots are significantly different at approximately the 0.05 level if the corresponding notches do not overlap. Refer to McGill, Tukey, and Larsen (1978) for more information. Figure 18.3 illustrates the NOTCHES option. Notice the folding effect at the bottom, which happens when the endpoint of a notch is beyond its corresponding quartile. This situation typically occurs when the group sample size is small.

NOTICKREP

applies to character-valued group variables and specifies that only the first occurrence of repeated, adjacent group values is to be labeled on the horizontal axis.

NOVANGLE

requests vertical axis labels that are oriented vertically. By default, the labels are drawn at an angle of 90 degrees if a software font is used.

NPANELPOS=n

NPANEL=n

specifies the number of group positions per panel. A panel is defined as a screen or page. You typically specify the NPANELPOS= option to display more box-and-whisker plots on a panel than the default number, which is n=20.

You can specify a positive or negative number for n. The absolute value of n must be at least 5. If n is positive, the number of positions is adjusted so that it is approximately equal to n and so that all panels display approximately the same number of group positions. If n is negative, no balancing is done, and each panel (except possibly the last) displays approximately |n| positions. In this case, the approximation is due only to axis scaling.

You can use the INTERVAL= option to change the effect of the NPANELPOS= option when a date or time format is associated with the group variable. The INTERVAL= option enables you to match the scale of the horizontal axis to the scale of the group variable without having to associate a different format with the group variable.

PAGENUM='string'

specifies the form of the label used for pagination. The string must be no longer than 16 characters, and it must include one or two occurrences of the substitution character `#'. The first `#' is replaced with the page number, and the optional second `#' is replaced with the total number of pages.

The PAGENUM= option is useful when you are working with a large number of groups, resulting in multiple pages of output. For example, suppose that each of the following PLOT statements produces multiple pages:

   proc boxplot data=pistons;
      plot diameter*hour / pagenum='Page #';
      plot diameter*hour / pagenum='Page # of #';
      plot diameter*hour / pagenum='#/#';
   run;

The third page produced by the first statement would be labeled Page 3. The third page produced by the second statement would be labeled Page 3 of 5. The third page produced by the third statement would be labeled 3/5.

By default, no page number is displayed.

PAGENUMPOS=TL | TR | BL | BR | TL100 | TR100 | BL0 | BR0

specifies where to position the page number requested with the PAGENUM= option. The keywords TL, TR, BL, and BR correspond to the positions top left, top right, bottom left, and bottom right, respectively. You can use the TL100 and TR100 keywords to ensure that the page number appears at the very top of a page when a title is displayed. The BL0 and BR0 keywords ensure that the page number appears at the very bottom of a page when footnotes are displayed.

The default keyword is BR.

PCTLDEF=index

specifies one of five definitions used to calculate percentiles in the construction of box-and-whisker plots. The index can be 1, 2, 3, 4, or 5. The five corresponding percentile definitions are discussed in the section "Percentile Definitions". The default index is 5.

REPEAT

REP

specifies that the horizontal axis of a plot that spans multiple pages is to be arranged so that the last group position on a page is repeated as the first group position on the next page. The REPEAT option facilitates cutting and pasting panels together. When a SAS DATETIME format is associated with the group variable, the REPEAT option is the default.

SKIPHLABELS=n

SKIPHLABEL=n

specifies the number n of consecutive tick mark labels, beginning with the second tick mark label, that are thinned (not displayed) on the horizontal (group) axis. For example, specifying SKIPHLABEL=1 causes every other label to be skipped. Specifying SKIPHLABEL=2 causes the second and third labels to be skipped, the fifth and sixth labels to be skipped, and so forth.

The default value of the SKIPHLABELS= option is the smallest value n for which tick mark labels do not collide. A specified n will be overridden to avoid collision. To reduce thinning, you can use the TURNHLABELS option.

SYMBOLLEGEND=LEGENDn

SYMBOLLEGEND=NONE

controls the legend for the levels of a symbol variable (see Example 18.1). You can specify SYMBOLLEGEND=LEGENDn, where n is the number of a LEGEND statement defined previously. You can specify SYMBOLLEGEND=NONE to suppress the default legend. Refer to SAS/GRAPH Software: Reference for more information on the LEGEND statement.

SYMBOLORDER=DATA | INTERNAL | FORMATTED

SYMORD=DATA | INTERNAL | FORMATTED

specifies the order in which symbols are assigned for levels of the symbol variable. The DATA keyword assigns symbols to values in the order in which values appear in the input data. The INTERNAL keyword assigns symbols based on sorted order of internal values of the symbol variable, and the FORMATTED keyword assigns them based on sorted formatted values. The default value is FORMATTED.

TOTPANELS=n

specifies the total number of panels to be used to display the plot. This option overrides the NPANEL= option.

TURNHLABELS

TURNHLABEL

turns the major tick mark labels for the horizontal (group) axis so that they are arranged vertically. By default, labels are arranged horizontally. You should specify a software font (using the FONT= option) in conjunction with the TURNHLABELS option. Otherwise, the labels may be displayed with a mixture of hardware and software fonts.

Note that arranging the labels vertically may leave insufficient room on the screen or page for a plot.

VAXIS=value-list

VAXIS=AXISn

specifies major tick mark values for the vertical axis of a box plot. The values must be listed in increasing order, must be evenly spaced, and must span the range of values displayed on the plot. You can specify the values with an explicit list or with an implicit list, as shown in the following example:

   proc boxplot;
      plot width*hour / vaxis=0 2 4 6 8;
      plot width*hour / vaxis=0 to 8 by 2;
   run;

You can also specify a previously defined AXIS statement with the VAXIS= option.

VMINOR=n

VM=n

specifies the number of minor tick marks between each major tick mark on the vertical axis. Minor tick marks are not labeled. By default, VMINOR=0.

VOFFSET=value

specifies the length in percent screen units of the offset at the ends of the vertical axis.

VREF=value-list

VREF=SAS-data-set

draws reference lines perpendicular to the vertical axis on the box plot. You can use this option in the following ways:

• Specify the values for the lines with a VREF= list. Examples of the VREF= option follow:
  
  

     vref=20
     vref=20 40 80
  

• Specify the values for the lines as the values of a numeric variable named _REF_ in a VREF= data set. Optionally, you can provide labels for the lines as values of a variable named _REFLAB_, which must be a character variable of length 16 or less. If you want distinct reference lines to be displayed in plots for different analysis variables specified in the PLOT statement, you must include a character variable named _VAR_, whose values are the names of the analysis variables. If you do not include the variable _VAR_, all of the lines are displayed in all of the plots.
  
  Each observation in the VREF= data set corresponds to a reference line. If BY variables are used in the input data set, the same BY variable structure must be used in the VREF= data set unless you specify the NOBYREF option.
  
  

VREFLABELS='label1' ... 'labeln'

specifies labels for the reference lines requested by the VREF= option. The number of labels must equal the number of lines. Enclose each label in quotes. Labels can be up to 16 characters.

VREFLABPOS=n

specifies the horizontal position of the VREFLABEL= label, as described in the following table. By default, n=1.

n	Label Position
1	left-justified in plot area
2	right-justified in plot area
3	left-justified in right margin

VZERO

forces the origin to be included in the vertical axis for a box plot.

WAXIS=n

specifies the width in pixels for the axis and frame lines. By default, n=1.

WGRID=n

specifies the width in pixels for grid lines requested with the ENDGRID and GRID options. By default, n=1.

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