Discriminant Analysis

Select menu: Stats | Multivariate Analysis | Discriminant Analysis

This menu performs discriminant analysis. The data for the menu is given by a set of variates defining the attributes of the units and a factor specifying the pre-defined groupings of the units from which the allocation is derived (the ‘training set’). Any unit with a missing value in any of the variates is excluded from the analysis. Note: The levels of the grouping factor must all exceed -9999, or a misallocation of the units may result.

After you have imported your data, from the menu select
Stats | Multivariate Analysis | Discriminant Analysis.
OR
Stats | Data Mining | Discriminant Analysis.
Fill in the fields as required then click Run.

You can set additional Options before running the analysis and store the results by clicking Store.

Available data

This lists data structures appropriate to the current input field. It lists either factors for specifying the groups, or variates for specifying the data. The contents will change as you move from one field to the next. Double-click on a name to copy it to the current input field or type the name.

Method

The type of discriminant analysis to use:

Linear discriminant analysis	A discriminant analysis that assumes all groups have a multivariate-normal distribution with a common variance-covariance matrix.
Quadratic discriminant analysis	A discriminant analysis that assumes each group has a multivariate-normal distribution with separate variance-covariance matrices.

Data to be analysed

Used to enter the names of the variates to be analysed defining the attributes of the units. You can transfer multiple selections from Available data by holding the Ctrl key on your keyboard while selecting items, then click to move them all across in one action.

Groupings for each training set

A factor specifying the pre-defined groupings of the units for each training set.

Action buttons

Run	Run the selected analysis.
Cancel	Close the dialog without further changes.
Options	Open the Linear Discriminant Analysis Options or Quadratic Discriminant Analysis Options dialog.
Store	Open the Linear Discriminant Analysis Store Options or the Quadratic Discriminant Analysis Store Options dialog.
Defaults	Reset options to their defaults. Right clicking on this button allows the selection of either User or Genstat defaults.
Trellis plot	Open the dialog which creates a 2D trellis plot of groups.

Action Icons

	Pin	Controls whether to keep the dialog open when you click Run. When the pin is down the dialog will remain open, otherwise when the pin is up the dialog will close.
	Restore	Restore names into edit fields and default settings.
	Clear	Clear all fields and list boxes.
	Help	Open the Help topic for this dialog.