pooledSD {nlme} | 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.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`lmList`

, `lm`

### Examples

fm1 <- lmList(Orthodont)
pooledSD(fm1)

[Package

*nlme* version 3.1-57

Index]