⌘K

Same period last year

windowwindow

The value from the matching period one year earlier — blank in the first year, where there is nothing to compare to.

Signature

Same period last year — applied to a measure along the chart's axis

A window calculation needs an ordered axis (a date or category on the chart), because it is computed across the points the chart already shows.

Same period last year — formula function · ChartBase Docs