Скачать или смотреть Insight VX Tutorials: iTab - Grid Overlays (Heatmap)

Heatmaps allow us to visualize our data by mapping the intensity of our results through the use of a colour range. It enables an easy comparison of results at a glance without even needing to look at the actual numbers.
By default, colours are assigned based on audience percentiles with a red to green colour range. The higher the percentile of the cell's audience figure in comparison with other cells, the greener the cell's shading will be (by default).

The statistics and colour ranges that the heatmap is based on are fully customizable and this is demonstrated in the video.

Heatmaps, by default, look at all of the grid's cells in comparison with one another, but this can be narrowed down to only compare the cells within each row or each column.