compareFits {nlme} | R Documentation

## Compare Fitted Objects

### Description

The columns in `object1` and `object2` are put together in matrices which allow direct comparison of the individual elements for each object. Missing columns in either object are replaced by `NA`s.

### Usage

    compareFits(object1, object2, which)

### Arguments

`object1,object2` | data frames, or matrices, with the same row names, but possibly different column names. These will usually correspond to coefficients from fitted objects with a grouping structure (e.g. `lme` and `lmList` objects).
`which` | an optional integer or character vector indicating which columns in `object1` and `object2` are to be used in the returned object. Defaults to all columns.

### Value

a three-dimensional array, with the third dimension given by the number of unique column names in either `object1` or `object2`. To each column name there corresponds a matrix with as many rows as the rows in `object1` and two columns, corresponding to `object1` and `object2`. The returned object inherits from class `compareFits`.

### Author(s)

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

### See Also

`plot.compareFits`, `pairs.compareFits`, `comparePred`, `coef`, `random.effects`

### Examples

    data(Orthodont)
    fm1 <- lmList(Orthodont)
    fm2 <- lme(fm1)
    compareFits(coef(fm1), coef(fm2))

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