Scatter Plot Confidence Ellipses

Multivariate Analyses

Scatter Plot Confidence Ellipses

You can generate confidence ellipses by setting the options in the multivariate output options dialog, shown in Figure 40.5, or by choosing from the Curves menu, shown in Figure 40.50.

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Figure 40.50: Curves Menu

Only 80% prediction confidence ellipses can be selected in the multivariate output options dialog. You must use the Curves menu to display mean confidence ellipses. You can use the confidence coefficient slider in the Confidence Ellipses table to change the coefficient for these ellipses.

Figure 40.35 displays part of a scatter plot matrix with 80% prediction confidence ellipses and the Correlation Matrix table with corresponding correlations highlighted. The ellipses graphically show a small negative correlation (-0.1176) between variables SEPALLEN and SEPALWID, a moderate negative correlation (-0.4284) between variables SEPALWID and PETALLEN, and a large positive correlation (0.8718) between variables SEPALLEN and PETALLEN.

Note	The confidence ellipses displayed in this illustration may not be appropriate since none of the scatter plots suggest bivariate normality.

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