You can specify a BY statement with PROC INBREED
to obtain separate
analyses on observations in groups defined by the BY variables.
When a BY statement appears, the procedure expects the input
DATA= data set to be sorted in
order of the BY variables.
- BY variables ;
If your input data set is not sorted in ascending
order, use one of the following alternatives:
- Use the SORT procedure with a similar
BY statement to sort the data.
- Use the BY statement options NOTSORTED or DESCENDING
in the BY statement for the INBREED procedure.
As a cautionary note, the NOTSORTED option does not
mean that the data are unsorted but rather that the
data are arranged in groups (according to values of
the BY variables), and these groups are not necessarily
in alphabetical or increasing numeric order.
- Use the DATASETS procedure (in base SAS software)
to create an index on the BY variables.
For more information on the BY statement, see the discussion
in SAS Language Reference: Concepts.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.