| Introduction to the FACTEX Procedure |
Using the FACTEX Procedure Interactively
By using the FACTEX procedure interactively, you can quickly explore
many design possibilities. The following steps provide one strategy
for interactive use:
- Invoke the procedure with the PROC FACTEX statement, and use a
FACTORS statement to identify factors in the design.
- For a design that involves blocking, use the BLOCKS and MODEL
statements. You may want to use the optimization features for the
BLOCKS statement.
- For a fractional replicate of a design, use the SIZE and MODEL
statements to specify the characteristics of the design. If the
design involves blocking, use a BLOCKS statement as well. If you
are unsure of the size of the design or of the number of blocks, use
the optimization features for either the BLOCKS or SIZE statement.
- Enter a RUN statement and check the SAS log to see if the design
exists. If a design exists, go on to the next step; otherwise,
modify the characteristics given in the
SIZE, BLOCKS, and MODEL statements.
- Examine the alias structure of the design. If it is not appropriate for
your situation, go back to step 2 and search for another design.
- After you have repeated steps 2, 3, and 4 and found an acceptable
design, use the OUTPUT statement to save the design. You can optionally
recode factor values, recode and rename the block factor, and create
new factors using output-value-settings.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
