merModLmerTest-class {lmerTest} | R Documentation

## Mixed Model Representations

### Description

The `merModLmerTest` contains `merMod` class of lme4 package and overloads `anova` and `summary` functions.

### Objects from the Class

Objects can be created via the `lmer` functions.

### See Also

`lmer()`

### Examples

    (m <- lmer(Reaction ~ Days + (1|Subject) + (0+Days|Subject),
                 data = sleepstudy))

    ## type 3 anova table with  denominator degrees of freedom
    ## calculated based on Satterthwaite's approximation
    anova(m)

    ## type 1 anova table with denominator degrees of freedom
    ## calculated based on Satterthwaite's approximation
    ## Not run:
    anova(m, type=1)

    ## End(Not run)

    ## type3 anova table with additional F statistics and denominator degrees of freedom
    ## calculated based on Kenward-Roger's approximation
    ## Not run:
    if(requireNamespace("pbkrtest", quietly = TRUE))
    anova(m, ddf="Kenward-Roger")

    ## End(Not run)

    ## anova table, that is returned by lme4 package
    anova(m, ddf="lme4")

    ## summary of merModLmerTest object. Returns the same as merMod object but with an
    ## additional column of p values for the t test.
    summary(m)

[Package lmerTest version 2.0-33 Index]