pooledSD {lme4} | R Documentation

## Extract pooled standard deviation

### Description

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.

### 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

`lmList`, `lm`

### Examples

    data(Orthodont)
    fm <- lmList(distance ~ age | Subject, Orthodont)
    pooledSD(fm)

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