Crosstabulations
he Crosstabulations dialog produces a table of counts for all combinations of specified categorical (factor) variables and returns the results as an ASCII formatted table. In addition, it calculates cell percentages and performs a Chi-square test for independence.
To construct a table of counts for use in further analyses, use the Tabulate dialog available from the Data menu.
To generate a contingency table
Choose Statistics Data Summaries
Crosstabulations. The dialog shown below appears.
Model page
On the Model page, specify parameters to be used in the crosstabulation.
In the Crosstabulations dialog, the Model page has the following options:
Data Set
Specify the name of the data set containing the columns and rows to be exported.
Variables
Use this only if each row represents multiple observations. Select the column that specifies the number of replications corresponding to each row.
Counts Variable
Use this only if each row represents multiple observations. Select the column that specifies the number of replications corresponding to each row.
Enter an S-PLUS expression that identifies the rows to use in the analysis. To use all the rows in the data set, leave this field blank.
Method to Handle Missing Variables
Select an option to handle missing data. Click on the link for more information.
Results
Enter the name for the object in which to save the results of the analysis.
Print Results
Select this to print out the results of the analysis in the designated output window.
Options page
On the Options page, all of the options are selected by default. To clear any of the options, click the corresponding check box.
In the Crosstabulations dialog, the Options page has the following options:
Drop Unused Levels
Suppress the display of any unused factor level in the contingency table.
Show Cell Proportions
Display the count in each cell as a proportion of the row total, the column total, and the grand total.
Show Marginal Totals
Display the row and column totals with the contingency table.
Run Chi-Square Test
Check this box to perform a Chi-Square test.
Decimal Places
Enter the number of decimal places with which to display each proportion.
Related S-Plus language functions
crosstabs, print.crosstabs