is about
data item
residual
residual mean square
https://github.com/ISA-tools/stato/issues/35
Alejandra Gonzalez-Beltran
http://support.minitab.com/en-us/minitab/17/topic-library/modeling-statistics/anova/anova-statistics/understanding-mean-squares/
Thomas Nichols
Philippe Rocca-Serra
http://en.wikipedia.org/wiki/Mean_squared_error#Regression
MSE
a residual mean square is a data item which is obtained by dividing the sum of squared residuals (SSR) by the number of degrees of freedom
Camille Maumet
used as an unbiased estimator of teh variance for a regression model
error mean square
ready for release