# pooledSD

From lme4 v0.99875-9
by Douglas Bates

##### 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.

- Keywords
- models

##### Usage

`pooledSD(object)`

##### Arguments

- object
- an object inheriting from class
`lmList`

.

##### Value

- 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.

##### See Also

##### Examples

`pooledSD(lmList(weight ~ Time | Chick, do.call("data.frame", ChickWeight)))`

*Documentation reproduced from package lme4, version 0.99875-9, License: GPL version 2 or later*

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