List of lm Objects with a Common Model

Usage

lmList(object, data, groups, level, na.action, pool)

Arguments

object Either a linear formula object, with the response on the left of a ~ operator and the terms, separated by + operators, on the right or a groupedData object. The method function lmList.groupedData is documented separately.
data a data frame in which to interpret the variables named in formula and groups.
groups an optional one-sided formula specifying the partitioning of the data according to which different lm fits should be performed. Defaults to getGroupsFormula(data), in which case data must inherit from class groupedData.
level an optional integer specifying the level of grouping to be used when multiple nested levels of grouping are present.
na.action a function that indicates what should happen when the data contain NAs. The default action (na.fail) causes lmList to print an error message and terminate if there are any incomplete observations.
pool an optional logical value that is preserved as an attribute of the returned value. This will be used as the default for pool in calculations of standard deviations or standard errors for summaries.

Description

Data is partitioned according to the levels of the grouping factor defined in groups, and individual lm fits are obtained for each data partition, using the model defined in object.

Value

a list of lm objects with as many components as the number of groups defined by groups. Generic functions such as coef, fixed.effects, lme, pairs, plot, predict, random.effects, summary, and update have methods that can be applied to an lmList object.

See Also

lm, lme.lmList.

Examples

library(lme)
data(Orthodont)
fm1 <- lmList(distance ~ age, Orthodont, groups = ~Subject)


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