Features
There is no inherent limit to the number of factors and the size of the design that you can construct with 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
designs, with and without blocking fractional factorial designs, such as
, with and without blocking split-plot and fractional split-plot designs
three-level designs, with and without blocking
mixed-level factorial designs, such as
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. After 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. After you have constructed a design, you can do the following:
print the design points
examine the alias structure for the design
modify the design by changing its size, changing the use of blocking, or specifying the effects of interest in the model again
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
) to values appropriate for your situation find another design