Nothing
df.residual.fRegress <- function(object, ...){
dfm <- object$df
if(is.null(dfm))
stop("'object' does not have a 'df' component.")
#
nobs <- length(object$wt)
dfr <- nobs-dfm
attr(dfr, 'nobs') <- nobs
attr(dfr, 'df.model') <- dfm
dfr
}
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