RESCALE Subcommand (RBF command)

The RESCALE subcommand is used to rescale covariates or scale dependent variables.

All rescaling is performed based on the training data, even if a testing or holdout sample is defined (see PARTITION Subcommand (RBF command)). That is, depending on the type of rescaling, the mean, standard deviation, minimum value, or maximum value of a covariate or dependent variable is computed using only the training data. It is important that these covariates or dependent variables have similar distributions across the training, testing, and holdout samples. If the data are partitioned by specifying percentages on the PARTITION subcommand, then the RBF procedure attempts to ensure this similarity by random assignment. However, if you use the PARTITION subcommand VARIABLE keyword to assign cases to the training, testing, and holdout samples, then we recommend that you confirm that the distributions are similar across samples before running the RBF procedure.

COVARIATE Keyword

The COVARIATE keyword specifies the rescaling method to use for covariates specified following WITH on the command line.

If no covariates are specified on the command line, then the COVARIATE keyword is ignored.

STANDARDIZED. Subtract the mean and divide by the standard deviation, (x-mean)/s. This is the default rescaling method for covariates.

NORMALIZED. Subtract the minimum and divide by the range, (x-min)/(max-min).

ADJNORMALIZED. Adjusted version of subtracting the minimum and dividing by the range, [2*(x-min)/(max-min)]-1 .

NONE. No rescaling of covariates.

DEPENDENT Keyword

The DEPENDENT keyword specifies the rescaling method to use for the dependent variables.

This keyword is applied only for scale dependent variables; that is, either MLEVEL=S is specified on the command line or the variable has a scale measurement level based on its data dictionary setting. If a dependent variable is not scale, then the DEPENDENT keyword is ignored for that variable.

STANDARDIZED. Subtract the mean and divide by the standard deviation, (x-mean)/s. This is the default rescaling method for scale dependent variables.

NORMALIZED. Subtract the minimum and divide by the range, (x-min)/(max-min).

ADJNORMALIZED. Adjusted version of subtracting the minimum and dividing by the range, [2*(x-min)/(max-min)]-1.

NONE. No rescaling of scale dependent variables.