CONVERT Statement
- CONVERT variable=newname ... / options;
The CONVERT statement lists the variables to be processed.
Only numeric variables can be processed.
For each of the variables listed,
a new variable name can be specified after
an equal sign to name the variable in the output data set that
contains the converted values.
If a name for the output series is not given,
the variable in the output data set has the same name as the input variable.
Any number of CONVERT statements can be used.
If no CONVERT statement is used, all the numeric variables in the
input data set except those appearing in the BY and ID statements are processed.
The following options can be used with the CONVERT statement.
-
METHOD=option
- METHOD=SPLINE( constraint [, constraint] )
-
specifies the method used to convert the data series.
The methods supported are SPLINE, JOIN, STEP, AGGREGATE, and NONE.
The METHOD= option specified on the PROC EXPAND statement
can be overridden for particular series by the METHOD= option
on the CONVERT statement. The default is METHOD=SPLINE.
The constraint specifications for METHOD=SPLINE can have
the values NOTAKNOT (the default), NATURAL, SLOPE=value,
and/or CURVATURE=value.
See the "Conversion Methods" section for more information about these
methods.
- OBSERVED=value
- OBSERVED=(from-value, to-value)
-
indicates the observation characteristics of the input time series
and of the output series.
The values supported are TOTAL, AVERAGE, BEGINNING, MIDDLE, and END.
In addition, DERIVATIVE can be specified as the to-value
when the SPLINE method is used.
See the section "The OBSERVED= Option" later in this chapter for details.
The default is the value specified for the OBSERVED= option on the
PROC EXPAND statement, if any,
or else the default value is OBSERVED=BEGINNING.
-
TRANSFORMIN=( operation ... )
-
specifies a list of transformations to be applied to the input series
before the interpolating function is fit.
The operations are applied in the order listed.
See the section "Transformation Operations" later in this chapter for
the operations that can be specified.
The TRANSFORMIN= option can be abbreviated as
TRANSIN=, TIN=, or TRANSFORM=.
-
TRANSFORMOUT=( operation ... )
-
specifies a list of transformations to be applied to the output series.
The operations are applied in the order listed.
See the section "Transformation Operations" later in this chapter for
the operations that can be specified.
The TRANSFORMOUT= option can be abbreviated as TRANSOUT=, or TOUT=.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
