Basic Analysis • Contingency Analysis • Mosaic Plot
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Mosaic Plot
The mosaic plot is a graphical representation of the two-way frequency table or Contingency Table. A mosaic plot is divided into rectangles, so that the vertical length of each rectangle is proportional to the proportions of the Y variable in each level of the X variable. The mosaic plot was introduced by Hartigan and Kleiner in 1981 and refined by Friendly (1994).
To produce the plot shown in Example of a Mosaic Plot, follow the instructions in Example of Contingency Analysis.
Example of a Mosaic Plot
Note the following about the mosaic plot in Example of a Mosaic Plot:
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The proportions on the x-axis represent the number of observations for each level of the X variable, which is country.
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The proportions on the y-axis at right represent the overall proportions of Small, Medium, and Large cars for the combined levels (American, European, and Japanese).
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The scale of the y-axis at left shows the response probability, with the whole axis being a probability of one (representing the total sample).
Clicking on a rectangle in the mosaic plot highlights the selection and highlights the corresponding data in the associated data table.
Replace variables in the mosaic plot by dragging and dropping a variable, in one of two ways: swap existing variables by dragging and dropping a variable from one axis to the other axis; or, click on a variable in the Columns panel of the associated data table and drag it onto an axis.
Context Menu
Right-click on the mosaic plot to change colors and label the cells.
Context Menu Options 
Set Colors
Shows the current assignment of colors to levels. See Set Colors.
Cell Labeling
Specify a label to be drawn in the mosaic plot. Select one of the following options:
Unlabeled
Shows no labels, and removes any of the other options.
Show Counts
Shows the number of observations in each cell.
Show Percents
Shows the percent of observations in each cell.
Show Labels
Shows the levels of the Y variable corresponding to each cell.
Show Row Labels
Shows the row labels for all of the rows represented by the cell.
Note: For descriptions of the remainder of the right-click options, see the Using JMP book.
Set Colors
When you select the Set Colors option, the Select Colors for Values window appears.
Select Colors for Values Window
The default mosaic colors depend on whether the response column is ordinal or nominal, and whether there is an existing Value Colors column property. To change the color for any level, click on the oval in the second column of colors and pick a new color.
Description of the Select Colors for Values Window 
Macros
Computes a color gradient between any two levels, as follows:
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If you select a range of levels (by dragging the mouse over the levels that you want to select, or pressing the SHIFT key and clicking the first and last level), the Gradient Between Selected Points option applies a color gradient to the levels that you have selected.
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The Gradient Between Ends option applies a gradient to all levels of the variable.
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Undo any of your changes by selecting Revert to Old Colors.
Color Theme
Changes the colors for each value based on a color theme.
Save Colors to Column
If you select this check box, a new column property (Value Colors) is added to the column in the associated data table. To edit this property from the data table, select Cols > Column Info.