| Syntax |
You can specify the following statements with the OPTEX procedure. Items within the brackets 
are optional.
- PROC OPTEX <options> ;
- CLASS class-variables ;
- MODEL effects </ options> ;
- BLOCKS block-specification <options> ;
- EXAMINE <options> ;
- GENERATE <options> ;
- ID variables ;
- OUTPUT OUT= SAS-data-set <options> ;
To generate a design, you have to use the PROC OPTEX and MODEL statements. You can use the other statements as needed. As the OPTEX procedure is interactive, you can use all statements (except the PROC OPTEX statement) after the first RUN statement.
Statement Ordering for Covariate Designs
You use the CLASS and MODEL statements to define a linear model for the runs in the candidate data set. You can also use these statements to define a general covariate model. In this case, list the CLASS and MODEL statements that define the model for the candidate points directly after the PROC OPTEX statement. Then list the CLASS and MODEL statements that define the covariate model after the BLOCKS DESIGN= specification. Thus, in this case, the ordering for these statements should be
PROC OPTEX statement
CLASS and MODEL statements for the candidate points
BLOCKS DESIGN= statement
CLASS and MODEL statements for the covariates
Note also that a CLASS statement naming classification variables must precede the MODEL statement that uses those variables.