Multiple Correspondence Analysis (MCA)

Select an Input option and Variable(s) via the Multiple Correspondence Analysis (MCA) tab and click the OK button in the Multiple Correspondence Analysis: Table Specifications Startup Panel to display the Multiple Correspondence Analysis Results dialog box, which contains four tabs: Quick, Advanced, Options, and Review.

Summary box. The Summary box at the top of the dialog box shows the number of factors and categories in the input table (Burt table; see MCA - Introductory Overview), the eigenvalues, and the value of the Pearson Chi-square for the two-way table, along with the respective degrees of freedom and p-value; however, note that the overall Chi-square value, the degrees of freedom, and associated p-value are only valid if the input table was an ordinary two-way table, which it is not. For details about the structure of a Burt table, see also MCA - Introductory Overview.

Note that the number of factors that will be retained for the spreadsheet of coordinates, and all plots of column points, is determined by the choice of options in the Number of dimensions group box on either the Quick tab or Options tab. To implement non-standard methods for standardizing the coordinates, click the Unstandardized matrices button on the Advanced tab, which will report the matrix of unstandardized generalized singular vectors from the singular value decomposition (see Computational Details). The spreadsheet reporting those matrices can then be easily accessed via STATISTICA Visual Basic for any additional computations.

Copy button. Click the Copy button to copy either the selected text (if text has been selected) in the Summary box or all of the text (if no text has been selected) to the Clipboard. Note that the copied text retains formatting information (such as font, color, etc.).

Contract/Expand button. Click the Contract/Expand button to contract or expand the Summary box. When contracted, you can see only one line of the Summary box text and can scroll through the text using a scroll bar. Note that when contracted the text is scrolled so that the first non-blank line is at the top. When expanded (the default setting), the entire Summary box will be displayed on the Multiple Correspondence Analysis Results dialog box.

Summary. Click the Summary button to display a spreadsheet with the coordinates for the column points, as well as various additional statistics that are useful for evaluating the adequacy of the number of dimensions in the current solution.

Cancel. Click the Cancel button to close the Multiple Correspondence Analysis Results dialog box and return to the Multiple Correspondence Analysis (MCA): Table Specifications Startup Panel.

Options. Click the Options button to display the Options menu.

For details concerning the typical statistics computed in a multiple correspondence analysis and their interpretation refer to the MCA - Introductory Overview; see also Computational Details.