A display that highlights departures from independence (‘residuals’) in a two-way table. The display, which is asymmetric, emphasizes the variations in the conditional probability of the categories of one variable, given the category of the second variable . For an alternative display that treats the variables in a symmetrical fashion, see cobweb diagram.

Mosaic display. The areas of the tiles are proportional to the cell frequencies. Dark shading indicates a large positive residual, pale shading a large negative residual.