by-lmby: List of lm objects with a common model
In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

by-lmby

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

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

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

Arguments

`data`	A dataframe
`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.
`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.

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)

doBy documentation built on Oct. 8, 2024, 1:06 a.m.