If an observation has missing data for any of
the variables used by the procedure, then that
observation is not used in the estimation process.
If one or more response variables are missing, but no factor
or covariate variables are missing, then predicted values
and confidence limits are computed for the output data set,
but the residual and Cook's D statistic are missing.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.