mkReTrms: Design Matrices and Variance Components for Random Effects

In pwr4exp: Power Analysis for Research Experiments

Design Matrices and Variance Components for Random Effects

Description

Adapted from lme4, this function constructs the design matrix (Z), variance-covariance matrix (G), etc.

Usage

mkReTrms(
  bars,
  fr,
  drop.unused.levels = TRUE,
  reorder.terms = FALSE,
  reorder.vars = FALSE
)

Arguments

bars	a list of parsed random-effects terms
fr	a model frame in which to evaluate these terms
drop.unused.levels	(logical) drop unused factor levels?
reorder.terms	arrange random effects terms in decreasing order of number of groups (factor levels)?
reorder.vars	arrange columns of individual random effects terms in alphabetical order?

Value

A list with the following components:

• Zt: Transposed random-effects design matrix.

• G: Variance-covariance matrix for random effects.

• Gind: Index mapping variance-covariance parameters to their positions in G.

• G_temp: List of individual variance component matrices for each random effect.

• flist: List of grouping factors used in random effects.

• cnms: Column names of the random-effects design matrix.

• Ztlist: List of per-term transposed design matrices for random effects.

• nl: Number of levels for each grouping factor.

pwr4exp documentation built on April 4, 2025, 1:46 a.m.