multilevelTools (version 0.2.0)

modelCompare.merMod: Compare two lmer models

Description

This function provides fit statistics and effect sizes for model comparisons. The models must be nested.

Usage

# S3 method for merMod
modelCompare(model1, model2, ...)

Value

a data table with the fit indices for each model and comparing models to each other.

Arguments

model1

A model estimated by lmer.

model2

A model estimated by lmer.

...

Additional arguments, not currently used but included to match generic.

References

For estimating the marginal and conditional R-squared values, see: Nakagawa, S. and Schielzeth, H. (2013). A general and simple method for obtaining R2 from generalized linear mixed-effects models. Methods in Ecology and Evolution, 4(2), 133-142. as well as: Johnson, P. C. (2014). Extension of Nakagawa & Schielzeth's R2GLMM to random slopes models. Methods in Ecology and Evolution, 5(9), 944-946.

Examples

library(JWileymisc)
data(aces_daily, package = "JWileymisc")
m1 <- lme4::lmer(PosAff ~ STRESS + (1 + STRESS | UserID),
  data = aces_daily)
m2 <- lme4::lmer(PosAff ~ STRESS + (1 | UserID),
  data = aces_daily)
m3 <- lme4::lmer(PosAff ~ STRESS + Female + (1 | UserID),
  data = aces_daily)

modelCompare(m1, m2)
modelCompare(m2, m3)

rm(m1, m2, m3)