PREDICT Statement
- PREDICT expression OUT=SAS-data-set <options>
;
The PREDICT statement enables you to construct predictions of an
expression across all of the observations in the input data set. Any
valid SAS programming expression involving the input data set
variables, parameters, and random effects is valid. Predicted
values are computed using the parameter estimates and empirical Bayes
estimates of the random effects. Standard errors of prediction are
computed using the delta method (Billingsley 1986). Results are
placed in an output data set that you specify with the OUT= option.
Besides all variables from the input data set, the OUT= data set
contains the following variables: Pred, StdErrPred, DF, tValue, Probt,
Alpha, Lower, Upper. You can also add other computed quantities to
this data set with the ID statement.
The following options are available in the PREDICT statement:
- ALPHA=
-
specifies the alpha level to be used in computing t statistics and
intervals. The default value corresponds to the ALPHA= option in
the PROC NLMIXED statement.
- DER
-
requests that derivatives of the predicted expression with respect to
all parameters be included in the OUT= data set. The variable names
for the derivatives are the same as the parameter names with the
prefix "Der_" appended. All of the derivatives are evaluated
at the final estimates of the parameters and the empirical Bayes
estimates of the random effects.
- DF=d
-
specifies the degrees of freedom to be used in computing t
statistics and intervals in the OUT= data set. The default value
corresponds to the DF= option in the PROC NLMIXED statement.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
