Estimate at completion

How is the estimate at completion figure calculated for different user preference settings?

Let’s take a project that runs from January to December and say the current month is August:

Calculation month Use maximum of actual vs forecast Forecast month Calculation
Two months ago Yes Actuals(Jan to May)+Max(Actuals(Jun) vs Forecast(Jun)) + Forecast(Jul to Dec)
Last month Yes Actuals(Jan to Jun)+Max(Actuals(Jul) vs Forecast(Jul)) + Forecast(Aug to Dec)
Current month Yes Actuals(Jan to Jul)+Max(Actuals(Aug) vs Forecast(Aug)) + Forecast(Sep to Dec)
Next month Yes Actuals(Jan to Aug)+Max(Actuals(Sep) vs Forecast(Sep)) + Forecast(Oct to Dec)
Two months ago No One month before Actuals(Jan to Jun)+Forecast(May to Dec)
Two months ago No Same month Actuals(Jan to Jun)+Forecast(Jun to Dec)
Two months ago No One month after Actuals(Jan to Jun)+Forecast(Jul to Dec)
Last month No One month before Actuals(Jan to Jul)+Forecast(Jun to Dec)
Last month No Same month Actuals(Jan to Jul)+Forecast(Jul to Dec)
Last month No One month after Actuals(Jan to Jul)+Forecast(Aug to Dec)
Current month No One month before Actuals(Jan to Aug)+Forecast(Jul to Dec)
Current month No Same month Actuals(Jan to Aug)+Forecast(Aug to Dec)
Current month No One month after Actuals(Jan to Aug)+Forecast(Sep to Dec)
Next month No One month before Actuals(Jan to Sep)+Forecast(Aug to Dec)
Next month No Same month Actuals(Jan to Sep)+Forecast(Sep to Dec)
Next month No One month after Actuals(Jan to Sep)+Forecast(Oct to Dec)