doBy (version 4.5-15)

lmBy: 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 differe

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.

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)