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distcholesky
2015 Apr 10
1
RFC: sigma() in package:stats ?
I'm proposing to add something like this to the stats package :
----------------------------------------------------------
### "The" sigma in lm/nls - "like" models:
sigma <- function(object, ...) UseMethod("sigma")
## works whenever deviance(), nobs() and coef() do fine:
sigma.default <- function (object, use.fallback=TRUE, ...)