General Regression Models Startup Panel

Ribbon bar. Select the Statistics tab. In the Advanced/Multivariate group, click Advanced Models and on the menu, select General Regression to display the General Regression Models Startup Panel.

Classic menus. On the Statistics - Advanced Linear/Nonlinear Models submenu, select General Regression Models to display the General Regression Models Startup Panel.

The Startup Panel contains one tab: Quick. Use these options to select the desired method of analysis (see also, Generalized Regression Models (GRM) - Index). In order to perform a general regression analysis, a data file must be selected at this point.

OK. Click the OK button to display the appropriate analysis specification dialog box, depending on the Specification method selected on the Quick tab.

Cancel

Click the Cancel button to close the Startup Panel without performing an analysis.

Options

See Options Menu for descriptions of the commands on this menu.

Open Data

Click the Open Data button to display the Select Data Source dialog box, which contains options to choose the spreadsheet on which to perform the analysis. The Select Data Source dialog box contains a list of the spreadsheets that are currently active.

Select Cases

Click the Select Cases button to display the Analysis/Graph Case Selection Conditions dialog box, which contains options to create conditions for which cases will be included (or excluded) in the current analysis. More information is available in the case selection conditions overview, syntax summary, and dialog box description.

W

Click the W (Weight) button to display the Analysis/Graph Case Weights dialog box, which contains options to adjust the contribution of individual cases to the outcome of the current analysis by "weighting" those cases in proportion to the values of a selected variable.

Weighted moments

This module can use fractional case weights in most computations. Some other modules use case weights as integer case multipliers or frequency values. In this module, when the Weighted moments check box is selected, each observation contributes the weighting variable's value for that observation. The weight values need not be integers.

DF = W-1 / N-1

When the Weighted moments check box is selected, moment statistics (e.g., mean, variance) can be based on the sum of the weight values for the weighting variable (W-1), or on the number of (unweighted) observations (N-1). The sums of squares and cross products will always be based on the weighted values of the respective observations. However, in computations requiring the degrees of freedom (e.g., standard deviation, ANOVA tables, etc.), the value for the degrees of freedom can either be computed as the sum of the weight values minus one, or as the number of observations minus one. Moment statistics are based on the sum of the weight values for the weighting variable if the W-1 option button is selected, and are based on the number of (unweighted) observations if the N-1 option button is selected. For more information on options for using integer case weights, see also Selecting a Weighting Variable.

For more information, refer to the Introductory Overview. See also GRM - Index, or Methods for Analysis of Variance.