RANDOM Subcommand (VARCOMP command)

The RANDOM subcommand allows you to specify random factors.

• You must specify at least one RANDOM subcommand with one random factor.
• You can specify multiple random factors on a RANDOM subcommand. You can also use multiple RANDOM subcommands. Specifications are accumulative.
• Only factors that are listed after the keyword BY in the variable list are allowed on the RANDOM subcommand.
• If you specify a factor on RANDOM, all effects containing the factor are automatically declared as random effects.

Example

VARCOM Y BY DRUG SUBJECT
 /RANDOM = SUBJECT
 /DESIGN = DRUG DRUG*SUBJECT.

• This example specifies a mixed model where DRUG is the fixed factor and SUBJECT is a random factor.
• The default method MINQUE(1) is used to estimate the contribution of the random effect DRUG*SUBJECT to the variance of the dependent variable.