Quantitative analysis -
MERR (Mean Error) : What is the average forecast error ?
MERR (-oo~oo) =1/n sum_(i=1)^n (F_i - O_i )RMSE (Root Mean Square Error) : What is the average magnitude of the forecast errors?
RMSE (0~oo) = $sqrt((1)/(n)sum_(i=1)^(n)(F_i-O_i)^2)$CORR (Correlation Coefficient) : How well did the forecast values correspond to the observed values ?
CORR (-1~1) =( sum (F - bar F )( O - bar O )) / ( sqrt( sum (F - bar F )^2 ) sqrt( sum (O - bar O )^2 ) )
