Dear Jen,
Actually you can check out what R does by looking at the source.
# first type the name of the function
> rstandard
function (model, ...)
UseMethod("rstandard")
<environment: namespace:stats>
# ?methods will list you the corresponding functions
> methods("rstandard")
[1] rstandard.glm rstandard.lm
# choose rstandard.lm
> rstandard.lm
function (model, infl = lm.influence(model, do.coef = FALSE),
sd = sqrt(deviance(model)/df.residual(model)), ...)
{
res <- infl$wt.res/(sd * sqrt(1 - infl$hat))
res[is.infinite(res)] <- NaN
res
}
# in case the function is not visible,
# you can use <package-name>:::<function-name> to display it
stats:::rstandard.lm
Best,
Denes
> Thanks Patrick - at least I know I wasn't being too silly :-)
> Jen
>
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