how do you calculate model accuracy how to calculate the accuracy of ets how to measure accuracy in forecast what is the forecast measure for different model steps how to calculate forecast accuracy ets model how to measure accuracy how to find forecast accuracy what is the accuracy measures of r how to determine accuracy measures in r average prediction accuracy measure r forecast accuracy measures how to find a forecast accuracy measure how to calculate forecast accuracy how to find forecast accuracy measures when to use h as an accuracy measure r how to measure forecast accuracy how does a forecast accuracy measure what is h in ets how do you find the forecast accuracy of each observation r estimating accuracy