R: List of lm objects with a common model

lmBy {doBy} | R Documentation

## List of lm objects with a common model

### Description

The data is split into strata according to the levels of the grouping factors and individual lm fits are obtained for each stratum.

### Usage

    lmBy(formula, data, id = NULL, ...)

### Arguments

`formula` | A linear model formula object of the form y ~ x1+...+xn | g1+...gm. In the formula object, y represents the response, x1,...,xn the covariates, and the grouping factors specifying the partitioning of the data according to which different lm fits should be performed.
`data` | A dataframe
`id` | A formula describing variables from data which are to be available also in the output.
`...` | Additional arguments passed on to `lm()`.

### Value

A list of lm fits.

### Note

This is a recent addition to the package; please report bugs.

### Author(s)

Søren Højsgaard, sorenh@math.aau.dk

### Examples

    bb <- lmBy(1/uptake~log(conc)|Treatment, data=CO2)

    coef(bb)

    fitted(bb)
    residuals(bb)

    summary(bb)
    coef(summary(bb))
    coef(summary(bb), simplify=TRUE)

[Package doBy version 4.5-15 Index]