Correspondence Analysis (CA)

Complete implementation of simple Correspondence Analysis (CA); see also the separate option for Multiple Correspondence Analysis (MCA). Various methods for specifying input data are supported, including the direct input of tables.

Element Name Description
General
Detail of computed results reported Specifies the level of computed results reported. At the Minimal level of detail, STATISTICA will report the summary row and column coordinates only. If Comprehensive results are requested, then plots of coordinates are reported as well, along with the observed input table. If All results is selected, then a large number of other diagnostic statistics are also reported (percentages, expected and residual values, etc.).
Input data format Select whether the input data describe raw data, frequency counts with grouping (row and column) variables, or frequency counts only (input data is an already aggregated and formatted table).

 If Raw data is selected, STATISTICA expects categorical column and row variables, with codes that identify to which group each observation belongs; the program will then compute the input table by tabulating the codes found in those variables.

 If Frequencies with grouping is requested, STATISTICA expects grouping variables (row and column), as well as a (continuous) variable with frequency counts (if more than one was specified, then separate analyses are performed for each).

 If Frequencies without grouping is specified, then STATISTICA expects a single variable list with frequency counts only (i.e., an already computed complete input table).
Method, number of dimensions Specifies whether to extract a fixed number of dimensions, or to use a cutoff value for the cumulative contribution to inertia in order to determine the number of dimensions for the final results.
Number of dimensions Specifies the number of dimensions for which to compute row and column coordinates (for spreadsheets and plots of points); this option is applicable only if the Method for determining the number of dimensions is set to Number of dimensions.
Cumul. contribution to inertia Specifies the total cumulative contribution to inertia at which point no additional dimensions are to be extracted; this option is applicable only if the Method for determining the number of dimensions is set to Cumulative contribution to inertia.
Standardization method Select the method of standardization for the coordinates.