Introduction to the FACTEX Procedure

Overview

The FACTEX procedure constructs orthogonal factorial experimental designs. These designs can be either full or fractional factorial designs, and they can be with or without blocks. Once you have constructed a design with the FACTEX procedure and run the experiment, you can analyze the results with a variety of SAS procedures including PROC GLM and PROC REG.

Factorial experiments are useful for studying the effects of various factors on a response. Texts that discuss experimental design include Box, Hunter, and Hunter (1978); Cochran and Cox (1957); Hogg and Ledolter (1992); Mason, Gunst, and Hess (1989); and Montgomery (1996). For details on the general mathematical theory of orthogonal factorial designs, refer to Bose (1947).

Note: For two-level designs, instead of using FACTEX directly, a more appropriate tool for you may be the ADX Interface. The ADX Interface, which has been completely revised in Version 7, is designed primarily for engineers and researchers who require a point-and-click solution for the entire experimental process, from building the designs through determining significant effects to optimization and reporting. ADX gives you most of the two-level designs provided by the FACTEX procedure in a system that integrates construction and analysis of designs and without the need for programming. In addition to two-level designs for standard models (with and without blocking), ADX makes it easy to use FACTEX to construct designs for estimating particular effects of interest. Morever, ADX also uses the OPTEX procedure to construct two-level designs of non-standard sizes. Information about the ADX Interface can be found at http://www.sas.com/rnd/app/qc/newadx/newadx.html .

Features

Learning about the FACTEX Procedure

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