pooledSD.RdThe pooled estimated standard deviation is obtained by adding together
the residual sum of squares for each non-null element of
object, dividing by the sum of the corresponding residual
degrees-of-freedom, and taking the square-root.
pooledSD(object)the pooled standard deviation for the non-null elements of
object, with an attribute df with the number of
degrees-of-freedom used in the estimation.
fm1 <- lmList(Orthodont)
pooledSD(fm1)
#> [1] 1.31004
#> attr(,"df")
#> [1] 54