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 multipleRANDOM
subcommands. Specifications are accumulative. - Only factors that are listed after the keyword
BY
in the variable list are allowed on theRANDOM
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 effectDRUG*SUBJECT
to the variance of the dependent variable.