# Formulas for : CVRMSE and Net Mean Bias

by paluee
Tags: bias, cvrmse, formulas
 HW Helper P: 1,371 The cvrmse is calculated the same way as the ordinary coefficient of variation, with the rmse replacing the standard deviation. that is, with $$c.v. = \frac{s}{\bar x}$$ you get $$cvrmse = \frac{RMSE}{\bar x}$$ There is some discussion of mean bias error in this document http://www.tva.gov/sami/met/eval/ch5.PDF although I'm not sure if it's what you are dealing with. It would be interesting to see the statistical reasoning behind this: I've never worked with these before, but it seems rather sketchy (not a reference to your comments).