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...Sheet data month actual forecast jan feb mar apr may jun jul aug sep demand metrics quantity forecasted mchockalingam error is with reference to the deviation average of absolute from mean cumulative abs relative or mad used in calculating tracking signal running signed values consecutive periods delta between subsequent observations sigma minus calculate root square squared rsquare durbinwatson autocorrelation mark chockalingam small letters indicate column indexes a b c d e f g h i j k l m n o p q r formula bc if db hb total author bias percent not recommended method since extremely will heavily influence this calculation use mase scaled formulamadmad attained on historical sales does have an intuitive explanation and widely adopted sr no value number arithmetic also called standard coefficient variation mpe mape madmean as wmape weighted ratio forecasting efficiency quotient mse rmse median mdape geometric gmrae formulas paramaeter symbols observationssample space y parameters adjus...