SAVE Subcommand (GENLIN command)

The SAVE subcommand adds predicted, residual, leverage, or Cook's distance values to the working dataset.

• Specify one or more temporary variables, each followed by an optional new name in parentheses.
• The optional names must be unique, valid variable names.
• If new names are not specified, then GENLIN uses the default names. If the default names conflict with existing variable names, then a suffix is added to the default names to make them unique.

The following rules describe the functionality of the SAVE subcommand when the response variable—either the dependent variable or the events or trials variable—has an invalid value for a case.

• If all factors and covariates in the model have valid values for the case, then the procedure computes predicted values but not the residuals. (The MISSING subcommand setting is taken into account when defining valid/invalid values for a factor.)
• An additional restriction for factors is that only those values of the factor actually used in building the model are considered valid. For example, suppose factor A takes values 1, 2, and 3 when the procedure builds the model. Also suppose there is a case with an invalid dependent variable value, a value of 4 on factor A, and valid values on all other factors and covariates. For this case, no predicted value is saved because there is no model coefficient corresponding to factor A = 4.

XBPRED (varname | rootname:n). Predicted value(s) of the linear predictor. For all distributions except the multinomial, XBPRED creates one variable and the default variable name is XBPredicted. Specify a variable name in parentheses to override the default.

For the multinomial distribution, one variable is created for each dependent variable category except the last (see the dependent variable ORDER keyword in the section Variable List (GENLIN command)). XBPRED saves the predicted values of the linear predictor for the first 25 categories, up to but not including the last, by default. The default root name is XBPredicted, and the default variable names are XBPredicted_1, XBPredicted_2, and so on, corresponding to the order of the dependent variable categories. Specify a root name in parentheses to override the default. Specify a colon and a positive integer giving the number of categories to override the default 25. To specify a number without a root name, simply enter a colon before the number.

XBSTDERROR (varname | rootname:n). Estimated standard error(s) of the predicted value of the linear predictor. For all distributions except the multinomial, XBSTDERROR creates one variable and the default variable name is XBStandardError. Specify a variable name in parentheses to override the default.

For the multinomial distribution, one variable is created for each dependent variable category except the last (see the dependent variable ORDER keyword in the section Variable List (GENLIN command)). XBSTDERROR saves the estimated standard errors for the first 25 categories, up to but not including the last, by default. The default root name is XBStandardError, and the default variable names are XBStandardError_1, XBStandardError_2, and so on, corresponding to the order of the dependent variable categories. Specify a root name in parentheses to override the default. Specify a colon and a positive integer giving the number of categories to override the default 25. To specify a number without a root name, simply enter a colon before the number.

MEANPRED (varname | rootname:n). Predicted value(s) of the mean of the response. For all distributions except the multinomial, MEANPRED creates one variable and the default variable name is MeanPredicted. Specify a variable name in parentheses to override the default.

If the binomial distribution is used and the dependent variable is in single variable format, then MEANPRED computes a predicted probability. Suppose the dependent variable has data values 0 and 1. If the default reference category is in effect, that is, REFERENCE = LAST on the GENLIN command line, then 1 is the reference category and MEANPRED computes the predicted probability that the dependent variable equals 0. To compute the predicted probability that the dependent variable equals 1 instead, specify REFERENCE = FIRST on the GENLIN command line.

If the binomial distribution is used and the dependent variable is in events/trials format, then MEANPRED computes the predicted number of events.

For the multinomial distribution, one variable is created for each dependent variable category except the last (see the dependent variable ORDER keyword in the section Variable List (GENLIN command)). MEANPRED saves the cumulative predicted probability for the first 25 categories, up to but not including the last, by default. The default root name is CumMeanPredicted, and the default variable names are CumMeanPredicted_1, CumMeanPredicted_2, and so on, corresponding to the order of the dependent variable categories. Specify a root name in parentheses to override the default. Specify a colon and a positive integer giving the number of categories to override the default 25. To specify a number without a root name, simply enter a colon before the number.

CIMEANPREDL (varname | rootname:n). Lower bound(s) of the confidence interval for the mean of the response. For all distributions except the multinomial, CIMEANPREDL creates one variable and the default variable name is CIMeanPredictedLower. Specify a variable name in parentheses to override the default.

For the multinomial distribution, one variable is created for each dependent variable category except the last (see the dependent variable ORDER keyword in the section Variable List (GENLIN command)). CIMEANPREDL saves the lower bound of the cumulative predicted probability for the first 25 categories, up to but not including the last, by default. The default root name is CICumMeanPredictedLower, and the default variable names are CICumMeanPredictedLower_1, CICumMeanPredictedLower_2, and so on, corresponding to the order of the dependent variable categories. Specify a root name in parentheses to override the default. Specify a colon and a positive integer giving the number of categories to override the default 25. To specify a number without a root name, simply enter a colon before the number.

CIMEANPREDU (varname | rootname:n). Upper bound(s) of the confidence interval for the mean of the response. For all distributions except the multinomial, CIMEANPREDU creates one variable and the default variable name is CIMeanPredictedUpper. Specify a variable name in parentheses to override the default.

For the multinomial distribution, one variable is created for each dependent variable category except the last (see the dependent variable ORDER keyword in the section Variable List (GENLIN command)). CIMEANPREDU saves the upper bound of the cumulative predicted probability for the first 25 categories, up to but not including the last, by default. The default root name is CICumMeanPredictedUpper, and the default variable names are CICumMeanPredictedUpper_1, CICumMeanPredictedUpper_2, and so on, corresponding to the order of the dependent variable categories. Specify a root name in parentheses to override the default. Specify a colon and a positive integer giving the number of categories to override the default 25. To specify a number without a root name, simply enter a colon before the number.

PREDVAL (varname). Predicted category value for binomial or multinomial distribution. The class or value predicted by the model if the binomial or multinomial distribution is in effect. This keyword is honored only if the binomial distribution is used, that is, if DISTRIBUTION = BINOMIAL is specified or implied on the MODEL subcommand and the dependent variable is in single variable format, or the multinomial distribution is used (DISTRIBUTION = MULTINOMIAL). Otherwise, the PREDVAL keyword is ignored with a warning. The default variable name is PredictedValue.

LEVERAGE (varname). Leverage value. The default variable name is Leverage. Leverage values are not available for the multinomial distribution or generalized estimating equations.

RESID (varname). Raw residual. The default variable name is Residual. Raw residuals are not available for the multinomial distribution.

PEARSONRESID (varname). Pearson residual. The default variable name is PearsonResidual. Pearson residuals are not available for the multinomial distribution.

DEVIANCERESID (varname). Deviance residual. The default variable name is DevianceResidual. Deviance residuals are not available for the multinomial distribution or generalized estimating equations.

STDPEARSONRESID (varname). Standardized Pearson residual. The default variable name is StdPearsonResidual. Standardized Pearson residuals are not available for the multinomial distribution or generalized estimating equations.

STDDEVIANCERESID (varname). Standardized deviance residual. The default variable name is StdDevianceResidual. Standardized deviance residuals are not available for the multinomial distribution or generalized estimating equations.

LIKELIHOODRESID (varname). Likelihood residual. The default variable name is LikelihoodResidual. Likelihood residuals are not available for the multinomial distribution or generalized estimating equations.

COOK (varname). Cook's distance. The default variable name is CooksDistance. Cook's distances are not available for the multinomial distribution or generalized estimating equations.