| Introduction to the FACTEX Procedure |
Features
There is no inherent limit to the number of factors and the size of
the design that you can construct using the FACTEX procedure.
Instead of looking up designs in an
internal table, the FACTEX procedure uses a general
algorithm to search for the construction rules for a specified design.
You can use the FACTEX procedure to generate designs such as the following:
- factorial designs, such as 23 designs, with and without
blocking
- fractional factorial designs, such as 24-1IV, with
and without blocking
- three-level designs, with and without blocking
- mixed-level factorial designs, such as 4 ×3 designs, with
and without blocking
- randomized complete block design
- factorial designs with outer arrays
- hyper-Graeco Latin square designs
You can also create more complex designs, such as incomplete block
designs, by using the FACTEX procedure in conjunction with the
DATA step.
You can save the design constructed by the FACTEX procedure in a SAS data set.
Once you have run your experiment, you can
add the values of the response variable and use
the GLM procedure
to perform analysis of variance and
study significance of effects.
The FACTEX procedure is an interactive procedure. After
specifying an initial design, you can submit additional statements
without reinvoking the procedure.
Once you have constructed a design, you can
- print the design points
- examine the alias structure for the design
- modify the design by changing its size, changing the use of blocking,
or respecifying the
effects of interest in the model
- output the design to a data set
- examine the confounding rules
that generate the design
- randomize the design
- replicate the design
- recode the design from standard values (such as
-1 and +1) to values appropriate for your situation
- find another design
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
