Generalized Additive Models Startup Panel and Quick Tab

Ribbon bar. Select the Data Mining tab. In the Learning group, click GAM to display the Generalized Additive Models Startup Panel.

Classic menus. On the Data Mining menu, select Generalized Additive Models to display the Generalized Additive Models Startup Panel.

The Startup Panel contains one tab: Quick.

For more information, refer to Data Mining with STATISTICA. See also the Generalized Additive Models Index, Overviews, and Example.

The Quick tab of the Generalized Additive Models Startup Panel contains options to select the distribution for the dependent variable, and the link function for the generalized linear model (note that the generalized additive models are an extension of generalized linear models, with similar choices of distributions and link functions).

Distribution, Link functions. Select a distribution from a wide variety of distributions for the dependent variable in the Distribution list. Then select a link function for the effects of the predictor variables on the dependent variable in the Link functions list. See McCullagh and Nelder, 1989; Hastie and Tibshirani, 1990; see also the GLZ Introductory Overview - Computational Approach for a discussion of link functions and distributions.

When Binomial distribution is selected in the Distribution list, the Logit link: f(z)=log(z/(1-z)) is available in the Link functions list. When the Normal, Gamma, and Poisson distributions are selected in the Distribution list, the Log link: f(z) = log(z), Inverse link: f(z) = 1/z, and Identity link: f(z) = z are available in the Link functions list.

OK. Click the OK button to display the GAM Specifications dialog box.

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 is used 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 is used 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 description.

W. Click the W (Weight) button to display the Analysis/Graph Case Weights dialog box, which is used 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.

MD deletion. Use the MD deletion group box to specify how STATISTICA should handle missing data. If Casewise deletion of missing data is selected, STATISTICA will ignore all cases that have missing data for any of the variables selected in the list. If Pairwise deletion of missing data is selected, all valid data points will be included in the analyses for the respective variables (resulting possibly in unequal valid N per variable).