Variable List (PLUM command)

The variable list specifies the dependent variable, factors, and covariates in the model.

• The dependent variable must be the first specification on the command line.
• The dependent variable is assumed to be an ordinal variable and can be of any type (numeric versus string). The order is determined by sorting the level of the dependent variable in ascending order. The lowest value defines the first category.
• Factor variables can be of any type (numeric versus string). Factor levels are sorted in ascending order. The lowest value defines the first category.
• Covariate variables must be numeric.
• Names of the factors follow the dependent variable separated by the keyword BY.
• Enter the covariates, if any, following the factors. Use the keyword WITH to separate covariates from factors (if any) and the dependent variable.