T-Test for Independent Samples by Groups - Advanced Tab

Select the Advanced tab of the T-Test for Independent Samples by Groups dialog box to access options to review advanced results of an independent t-test, including a wide variety of categorized plots.

Summary: T-tests

Click the Summary:T-tests button to compute the t-tests for independent samples and display the results in a spreadsheet.

The detail and formatting of the results depends on your selections in the Options tab.

Box & whisker plots

1. Click the Box & whisker plots button to produce a cascade of box and whisker plots for the dependent variables; one box plot for each variable will be produced. Box and whisker plots summarize the distribution of the dependent variable for each group. Specifically, each group will be represented by one box and whisker component, which is made up of three parts:
   • A central line to indicate central tendency or location;
   • A box to indicate variability around this central tendency;
   • Whiskers around the box to indicate the range of the variable.
2. Click this button to display the Box-Whisker Type dialog box, which contains options to specify a box and whisker type plot.

   Categorized histograms

Click the Categorized histograms button to produce a cascade of categorized histograms (one for each dependent variable), summarizing the distribution of the respective variable in the two groups.

Categorized normal probability plots

Click the Categorized normal probability plots button to produce a cascade of categorized normal probability plots for the dependent variables, categorized by the two groups.

Categorized half-normal probability plots

Click the Categorized half-normal probability plots button to produce a cascade of categorized half-normal probability plots for the dependent variables, categorized by the two groups.

Categorized detrended probability plots

Click the Categorized detrended probability plots button to produce a cascade of categorized detrended normal probability plots for the dependent variables, categorized by the two groups.

Categorized scatterplots

1. Click the Categorized scatterplots button to produce a cascade of categorized scatterplots for selected pairs of variables, one plot per pair.
2. Select two lists of variables (from the list of dependent variables) via the standard variable selection dialog box. Scatterplots will be produced for each variable in the first list with each variable in the second list, categorized by the two groups for the t-test.