## Scatter Plot Matrix

Scatter plots are displayed for pairs of variables.
Without **X** variables, scatter plots are displayed as
a symmetric matrix containing each pair of **Y** variables.
With a nominal **Y** variable, scatter plots are displayed as
a symmetric matrix containing each pair of **X** variables.
When both interval **Y** variables and interval **X** variables
are selected, scatter plots are displayed as
a rectangular matrix with **Y** variables as the row variables
and **X** variables as the column variables.

Figure 40.35 displays part of a scatter plot
matrix with 80% prediction confidence ellipses.

**Figure 40.35:** Scatter Plot Matrix with 80% Prediction Confidence Ellipses

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