Extract pooled standard deviation
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.
- an object inheriting from class
- the pooled standard deviation for the non-null elements of
object, with an attribute
dfwith the number of degrees-of-freedom used in the estimation.
pooledSD(lmList(weight ~ Time | Chick, do.call("data.frame", ChickWeight)))
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