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Details of the FACTEX Procedure |

**FACTORS***factor-names*< /*option*>**;**-
You use the FACTORS statement to start the construction of
a new design by naming the factors
in the design.
The FACTORS statement clears all previous specifications for the
design (number of runs, block size, and so on). Use it when you
want to start a new design.
**Note that the FACTORS statement should be the first statement following the PROC FACTEX statement.**

In the FACTORS statement, *factor-names*-
lists names for the
factors in the design. These names must be valid SAS variable
names. See "Types of Factors"
for details.

The following*option*is available:

**NLEV=***q*-
specifies the number of levels for each factor in the design.
The value of
*q*must be an integer greater than or equal to 2.**The default value for**In order to construct a design that involves either fractionation or blocking,*q*is 2.*q*must be either a prime number or an integer power of a prime number. For the reason behind this restriction, see "Structure of General Factorial Designs" .

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