Example of a matrix of plots with groups
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You are investigating the possible correlation between several different measurements made on wild bears. You feel that the sex of the bear might be an important factor in the relationships between the different variables. To begin your analysis, you create a matrix of plots with sex as a grouping variable.

1    Open the worksheet BEARS2.MTW.

2    Choose Graph > Matrix Plot.

3    Choose Matrix of plots - With Groups, then click OK.

4    In Graph variables, enter 'Head.L'  'Head.W'  'Neck.G'  'Chest.G'  'Weight'.

5    In Categorical variables for grouping (0-3), enter Sex.

6    Click Matrix Options.

7    Under Matrix Display, choose Lower left. Click OK in each dialog box.

Graph window output

Interpreting the results

While measurements of female bears were generally smaller, you see no dramatic difference in the slope and spread of the female and male data points.