[R] studentized and standarized residuals

[Jen]

Hi,
I must be doing something silly here, because I can't get the studentised
and standardised residuals from r output of a linear model to agree with
what I think they should be from equation form. 
Thanks in advance,
Jennifer

x = seq(1,10)
y = x + rnorm(10)
mod = lm(y~x)
rstandard(mod)
residuals(mod)/(summary(mod)$sigma)
rstudent(mod)
residuals(mod)/(summary(mod)$sigma*sqrt(1-lm.influence(mod)$hat))

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