Standard deviation from lm in r

Question

How do you get the standard deviation from a lm in R? summary(model) automatically prints the standard error, however in the litterature you a often supposed to report the standard deviation. The degrees of freedom is reported as 47 and 3423.

Answer 1

In R, residual standard error refers to the estimated standard deviation of errors. This phrasing is specific to R.

?summary.lm

Value -> sigma : "the square root of the estimated variance of the random error"