by-lmby: List of lm objects with a common model

In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

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, [e-mail]

Examples

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

fitted(lm_lst)
residuals(lm_lst)

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

doBy documentation built on June 30, 2025, 1:06 a.m.