Deviance computations as used in mfp in stata
deviance_gaussian(rss, weights, n)A numeric value representing the deviance of a Gaussian model.
residual sum of squares.
numeric vector of weights used in computation of rss.
number of observations used to compute rss.
Note that this is not the usual formula of deviance used in R, but uses the formula found here https://www.stata.com/manuals/rfp.pdf.
It can be applied for normal error models, but should not be used for other kinds of glms.