PREDICT Statement
- PREDICT | PRED | P predict-options ;
You can specify the following options in a
PREDICT statement.
- MAXPOINTS=number
- MAXPOINTS=number
- MAXP=number
-
specifies the maximum number of data
points in a neighborhood. You specify this
option in conjunction with
the RADIUS= option. When the number of
data points in the neighborhood
formed at a given
grid point by the RADIUS= option is
greater than the MAXPOINTS= value, the
RADIUS= value is decreased just enough
to honor the MAXPOINTS= value unless you specify
the NODECREMENT option.
- MINPOINTS=number
- MINP=number
- MIN=number
-
specifies the minimum number of data
points in a neighborhood. You specify this
option in conjunction with
the RADIUS= option. When the number of
data points in the neighborhood
formed at a given
grid point by the RADIUS= option is
less than the MINPOINTS= value, the
RADIUS= value is increased just enough
to honor the MINPOINTS= value unless you specify
the NOINCREMENT option.
The default
is MINPOINTS=20. If enough
data are available, this value should be
increased to 30 to improve estimation.
- NODECREMENT | NODECR
-
requests that the RADIUS= value not be decremented when
the MAX= value is exceeded at a grid point. This option
is relevant only when you specify both a RADIUS= value and a
MAXPOINTS= value. In this case, when
the number of points in the neighborhood
constructed from the
RADIUS= specification is greater than the
MAXPOINTS= value, the RADIUS= value is decremented
enough to honor the MAXPOINTS= value, and the
kriging system is solved for this grid point.
If you specify the NODECREMENT option, no decrementing is
done, estimation is skipped at this
grid point, and a message is written to the log.
- NOINCREMENT | NOINCR
-
requests that the RADIUS= value not be incremented when
the MIN= value is not met at a grid point. This option
is relevant only when you specify both a RADIUS= value and a
MINPOINTS= number. In this case, when
the number of points in the neighborhood
constructed from the
RADIUS= specification is less than the
MINPOINTS= value, the RADIUS= value is incremented
enough to honor the MINPOINTS= value, and the
kriging system is solved for this grid point.
If you specify the NOINCREMENT option, no incrementing is
done, estimation is skipped at this
grid point, and a message is written to the log.
- NUMPOINTS=number
- NPOINTS=number
- NPTS=number
- NP=number
-
specifies the exact size of a neighborhood.
This option is incompatible with all other
PREDICT statement options controlling the
neighborhood; it must appear by itself.
- RADIUS=number
- R=number
-
specifies the radius to use in a local
kriging regression. When you specify this option,
a separate kriging system is
solved at each grid point by finding
the neighborhood of this grid point
consisting of all data points
within the distance specified by
the RADIUS= value. See the
MAXPOINTS=
and MINPOINTS= options for
additional control on the neighborhood.
- VAR= variable-name
-
specifies the single numeric variable used in the kriging
system.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
