Multiple Correspondence Analysis

Select menu: Stats | Multivariate Analysis | Multiple Correspondence Analysis

Correspondence analysis is an ordination technique used to analyse relationships between two categorical variables. Ordination techniques aim to represent the relationships approximately, in a reduced number of dimensions, to make them easier to study e.g. with graphs. Multiple correspondence analysis provides a similar analysis for more than two variables.

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

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

Available data

This lists data structures appropriate to the current input field. It lists variates for use in specifying the data. Double-click a name to copy it to the current input field or type the name.

Data

Used to enter the names of the factors to be analysed. 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. If the data are referenced within a pointer you can enter the pointer name directly followed by its elements within squared brackets, e.g. mydata[1,2].

Frequencies

A variate defining frequencies (or number or replications) for each unit for the factors supplied in the Data. Supply the data in this form can be useful for large data sets.

Action buttons

Run	Run the analysis.
Cancel	Close the dialog without further changes.
Options	Opens a dialog where additional options and settings can be specified for the analysis.
Defaults	Reset options to the default settings. Clicking the right mouse on this button produces a pop-up menu where you can choose to set the menu using the currently stored defaults or the Genstat default settings.
Store	Opens a dialog to specify names of structures to store the results from the analysis.
Biplot	Opens a dialog to produce a biplot of the results from the analysis.

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.