Like the significance testing, it would be great to have a delta statistic available in my tables. It should work either on rows or on columns, and should work out the difference between one cell and another cell in a selected position. For example, if the delta is calculated within a row on my table (across columns), calculating it between the cell in each column and the most immediately preceding cell to the left (like significance testing against previous period). The result should be shown either as a value, an ▲ or ▼ (or a selectable pair of characters), and should be highlighted in a color I set. It should be possible to specify which columns I want to calculate this for, but the default should be for each pair of columns in the table (within spans).