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2020 Oct 28
0
nlme: New variance function structure varConstProp
Dear R developers,
recently I have written a wishlist bug report for nlme containing a patch that
adds the variance function structure
s2(v) = t1^2 + t2^2*v^2
where v denotes the variance covariate, s2(v) denotes the variance function
evaluated at v, and t, t1 and t2 are the variance function coefficients. The
covariate can also be the fitted response.
The idea that the residual variance