An output data set containing the design matrix is created whenever you specify the OUTDESIGN= option in the PROC GLMMOD statement. The OUTDESIGN= data set contains an observation for each observation in the DATA= data set, with the following variables:

• the dependent variables

• the FREQ variable, if any

• the WEIGHT variable, if any

• a variable for each column of the design matrix, with names COL1, COL2, and so forth

If there are BY-group variables or if the pattern of missing values for the dependent variables requires it, the single data set contains several design matrices. In this case, for each of these, the OUTDESIGN= data set also contains the following:

• the current values of the BY variables, if you specify a BY statement

• a numeric variable, _YPASS_, containing the current pass of the data, if the pattern of missing values for the dependent variables requires multiple passes