General Discriminant Analysis (GDA) Models Syntax Editor - Specifications Tab

Select the Specifications tab of the General Discriminant Analysis (GDA) Models Syntax Editor dialog to access the options described here. The available specifications are described in detail below. Refer to the GLM syntax overview for additional details. Refer also to the description of the GLM keyword DESIGN syntax for a description of how the numerical and mathematical characters can be used.

Element Name Description
Variables Click the Variables button to display the Variable Names to Insert dialog; the selected variables (variable names) will be transferred to Analysis syntax edit field on the GDA Models Syntax Editor dialog, at the current location of the cursor.

1, 2, ..., 0, /, . Click these buttons to insert the respective numeric character or symbol into the Analysis syntax edit field, at the current location of the cursor.

+, _+_, ..., _=_. Click these buttons to insert the respective symbols into the Analysis syntax edit field, at the current location of the cursor.

_, (, ..., ¿. Click these buttons to insert the respective symbols into the Analysis syntax edit field, at the current location of the cursor.

estimated Click the estimated button to insert the specification estimated into the Analysis syntax edit field, at the current location of the cursor. This option is used in conjunction with the PRIORS keyword to specify prior classification probabilities for the classes (categories or groups) proportional to the observed class N's. For example, suppose a dependent variable contains codes that specify two groups, and the data file contains 7 observations in group 1 and 3 in group 2 (and there are 10 observations in total), then this option will set the prior probabilities as equal 0.7 and 0.3, respectively. For more information on model building methods, see the Introductory Overview.
equal Click the equal button to insert the specification equal into the Analysis syntax edit field, at the current location of the cursor. This option is used in conjunction with the PRIORS keyword to specify equal prior classification probabilities for all classes (categories or groups). For example, suppose a dependent variable contains codes that specify two groups; then each group would be assigned a prior classification probability of 0.5 (regardless of the observed class n's). For more information on model building methods, see the Introductory Overview.
user Click the user button to insert the specification user into the Analysis syntax edit field, at the current location of the cursor. This option is used in conjunction with the PRIORS keyword to specify a user-defined values list of prior classification probabilities; the number of values that are specified in the value list of user defined prior probability values must be equal to the number of classes or groups specified in the DEPENDENT variable; also, the values should sum to 1.0; if they do not they will be proportionately adjusted. For more information on model building methods, see the Introductory Overview.
Example PRIORS = user (.3 .3 .4)
no Click the no button to insert the specification no into the Analysis syntax edit field, at the current location of the cursor. This option is used in conjunction with the LACKOFFIT keyword, which can be used to request (option yes) or not request (option no) the computation of pure error to test the lack-of-fit of the overall model.
yes Click the yes button to insert the specification yes into the Analysis syntax edit field, at the current location of the cursor. This option is used in conjunction with the LACKOFFIT keyword, which can be used to request (option yes) or not request (option no) the computation of pure error to test the lack-of-fit of the overall model.
none Click the none button to insert the specification none into the Analysis syntax edit field, at the current location of the cursor. This option is used in conjunction with the keywords ESTIMATE, RANDOM, SURFACE, MIXTURE, REPEATED, WDESIGN, and SAMPLE.
Options for MBUILD When you select the MBUILD button, the Options for MBUILD dialog is displayed.

See also: GDA - Index, GDA Syntax Overview, and GDA Syntax Examples.