plot.lmList4 {lme4} | R Documentation

## plots for lmList4 objects

### Description

diagnostic and confidence-interval plots for `lmList` fits

### Usage

    ## S3 method for class 'lmList4'
    plot(x, form, abline, id, idLabels, grid, ...)
    ## S3 method for class 'lmList4.confint'
    plot(x, y, order, ...)

### Arguments

`x` | an object inheriting from class `lmList`, representing a list of `lm` objects with a common model.
`y` | ignored: for agreement with generic method

`form`

an optional formula specifying the desired type of plot. Any variable present in the original data frame used to obtain `x` can be referenced. In addition, `x` itself can be referenced in the formula using the symbol `"."`. Conditional expressions on the right of a `|` operator can be used to define separate panels in a Trellis display. Default is `resid(., type = "pool") ~ fitted(.)` , corresponding to a plot of the standardized residuals (using a pooled estimate for the residual standard error) versus fitted values.

`abline` | an optional numeric value, or numeric vector of length two. If given as a single value, a horizontal line will be added to the plot at that coordinate; else, if given as a vector, its values are used as the intercept and slope for a line added to the plot. If missing, no lines are added to the plot.

`id`

an optional numeric value, or one-sided formula. If given as a value, it is used as a significance level for a two-sided outlier test for the standardized residuals. Observations with absolute standardized residuals greater than the 1 - value/2 quantile of the standard normal distribution are identified in the plot using `idLabels`. If given as a one-sided formula, its right hand side must evaluate to a logical, integer, or character vector which is used to identify observations in the plot. If missing, no observations are identified.

`idLabels` | an optional vector, or one-sided formula. If given as a vector, it is converted to character and used to label the observations identified according to `id`. If given as a one-sided formula, its right hand side must evaluate to a vector which is converted to character and used to label the identified observations. Default is `getGroups(x)`.
`grid` | an optional logical value indicating whether a grid should be added to plot. Default depends on the type of Trellis plot used: if `xyplot` defaults to `TRUE`, else defaults to `FALSE`.
`order` | which coefficient to order the results by
`...` | optional arguments passed to the Trellis plot function.

### Details

The `plot` method for `lmList4` objects is copied from that for `lmList` objects; see `plot.lmList` for details.

### Author(s)

Original versions in `nlme` package by Jose Pinheiro and Douglas Bates

### Examples

    fm.plm  <- lmList(Reaction ~ Days | Subject, sleepstudy)
    ## diagnostic plot: standardized residuals vs. fitted
    plot(fm.plm,id=0.05)
    ci <- confint(fm.plm)
    ## plot CIs, ordered by slope (coefficient 2)
    plot(ci,order=2,ylab="Subject")

[Package lme4 version 1.1-12 Index]