General ANOVA/MANOVA

Ribbon bar. Select the Statistics tab. In the Base group, click ANOVA to display the General ANOVA/MANOVA dialog box.

Classic menus. On the Statistics menu, select ANOVA to display the General ANOVA/MANOVA dialog box.

This dialog box contains one tab, Quick, which contains options to select the desired method of analysis (see also, General ANOVA/MANOVA - Index). In order to perform a General ANOVA/MANOVA analysis, a data file must be selected at this point.

OK. Click this button to display an analysis specification dialog box, which differs depending on the Specification method selected on the Quick tab.

Cancel. Click this button to close the dialog box without performing an analysis.

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

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

Select Cases. Click this 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 and syntax summary.

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. Select this check box to specify that each observation contributes the weighting variable's value for that observation. The weight values need not be integers. This module can use fractional case weights in most computations. Some other modules use case weights as integer case multipliers or frequency values. This option will only be available after you have defined a weight variable via the W option described above.

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), the value for the degrees of freedom can either be computed based on the sum of the weight values, or based on the number of observations. 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 options button is selected. For more information on options for using integer case weights, see also Define Weight.

For more information, refer to the Introductory Overview. See also General ANOVA/MANOVA - Index or Methods for Analysis of Variance. For related ANOVA and regression methods, refer also to GLM, DOE and Variance Components.