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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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1352 REGRESSION<br />

Overview<br />

Options<br />

REGRESSION calculates multiple regression equations and associated statistics and plots.<br />

REGRESSION also calculates collinearity diagnostics, predicted values, residuals, measures<br />

of fit and influence, and several statistics based on these measures (see the section on residuals<br />

beginning on p. 1367).<br />

Input and Output Control Subcommands. DESCRIPTIVES requests descriptive statistics on the<br />

variables in the analysis. SELECT estimates the model based on a subset of cases. REGWGT<br />

specifies a weight variable for estimating weighted least-squares models. MISSING specifies<br />

the treatment of cases with missing values. MATRIX reads and writes matrix data files.<br />

Equation-Control Subcommands. These optional subcommands control the calculation and<br />

display of statistics for each equation. STATISTICS controls the statistics displayed for the<br />

equation(s) and the independent variable(s), CRITERIA specifies the criteria used by the<br />

variable selection method, and ORIGIN specifies whether regression is through the origin.<br />

Analysis of Residuals, Fit, and Influence. The optional subcommands that analyze and plot<br />

residuals and add new variables to the working data file containing predicted values, residuals,<br />

measures of fit and influence, or related information, are described starting on p. 1367.<br />

These subcommands apply to the final equation.<br />

Basic Specification<br />

The basic specification is DEPENDENT, which initiates the equation(s) and defines at least<br />

one dependent variable, followed by METHOD, which specifies the method for selecting<br />

independent variables.<br />

• By default, all variables named on DEPENDENT and METHOD are used in the analysis.<br />

• The default display for each equation includes a Model Summary table showing R 2 , an<br />

ANOVA table, a Coefficients table displaying related statistics for variables in the equation,<br />

and an Excluded Variables table displaying related statistics for variables not yet in<br />

the equation.<br />

• By default, all cases in the working data file with valid values for all selected variables<br />

are used to compute the correlation matrix on which the regression equations are based.<br />

The default equations include a constant (intercept).

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