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The 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)
an object inheriting from class lmList
.
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.
# NOT RUN {
fm1 <- lmList(Orthodont)
pooledSD(fm1)
# }
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