A common source of errors in Excel is "the gap"—a situation where you add new data to the bottom of a list, but your formulas ...
FORECAST.ETS applies an exponential triple smoothing (ETS) algorithm to create forecasts that can include trend and seasonal components. The syntax for the FORECAST.ETS is =FORECAST.ETS (target_date, ...
Tables, named ranges, line breaks, modern functions, and helper columns make Excel formulas easier to read, audit, and fix.