Model choice and diagnostics for linear mixed-effects models using statistics on street corners

Adam Loy, Heike Hofmann, Dianne Cook

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)


The complexity of linear mixed-effects (LME) models means that traditional diagnostics are rendered less effective. This is due to a breakdown of asymptotic results, boundary issues, and visible patterns in residual plots that are introduced by the model fitting process. Some of these issues are well known and adjustments have been proposed. Working with LME models typically requires that the analyst keeps track of all the special circumstances that may arise. In this article, we illustrate a simpler but generally applicable approach to diagnosing LME models. We explain how to use new visual inference methods for these purposes. The approach provides a unified framework for diagnosing LME fits and for model selection. We illustrate the use of this approach on several commonly available datasets. A large-scale Amazon Turk study was used to validate the methods. R code is provided for the analyses. Supplementary materials for this article are available online.

Original languageEnglish
Pages (from-to)478-492
Number of pages15
JournalJournal of Computational and Graphical Statistics
Issue number3
Publication statusPublished - 2017


  • Lineup protocol
  • Model diagnostics
  • Model selection
  • Statistical graphics
  • Visual inference

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