Code

Derivative computations and robust standard errors for linear mixed effects models in lme4.

Replication materials:

  • estfun method for obtaining scores from models of class lmerMod.
  • vcov method for obtaining covariance matrix of all parameters (including random effect parameters) from models of class lmerMod.
  • bread function for using the above code in tandem with package sandwich.
  • Replication script containing code to run and summarize results from the paper, using the above files.

Score-based tests of differential item functioning via pairwise maximum likelihood estimation.

Replication materials:

  • Simulation functions for data generation, power evaluation, and power summaries.
  • lavaan extensions containing estfun() method for lavaan objects estimated via PML and code to simplify model estimation (note: this code relies on lavaan 0.5-17).
  • Code to obtain scores from specific ltm objects and mirt objects.
  • Data from application section
  • Replication script containing code to run and summarize the application and simulations, using the above files.

Bayesian latent variable models for the analysis of experimental psychology data.

Replication materials:

Score-based tests of measurement invariance: Use in practice.

Replication materials:

  • Model estimation functions for simulations.
  • Simulation functions for data generation, power evaluation, and power summaries.
  • Replication script containing code to run and summarize the tutorial and simulations, using the above files. (Note: strucchange 1.5-0 and lavaan 0.5-14 contain code necessary to carry out the tests for general SEMs.)