Percentage be found by multiplying first, so in this example the 50 would be multiplied by 100 to give 5,000, and this result would be divided by 1250 to give 4%. To calculate a percentage of a percentage, convert both percentages to fractions of 100, or to decimals, and multiply them. For example, 50% of 40% is: It is not correct to divide by 100 and use the percent sign at the same time. (E.g. , not , which actually is . A term such as would also be incorrect, this would be read as 1 percent even if the intent
Mean percentage error used as a measure of the bias in the forecasts. A disadvantage of this measure is that it is undefined whenever a single actual value is zero. Mean percentage error In statistics, the mean percentage error (MPE) is the computed average of percentage errors by which forecasts of a model differ from actual values of the quantity being forecast. The formula for the mean percentage error is: where "a" is the actual value of the quantity being forecast, "f" is the forecast, and "n" is the number of different times for which the variable is forecast. Because actual rather than