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Modern Solomon analysis

Unified regression, likelihood, and randomization-based methods.

fit_solomon_glm()
Fit the unified GLM for a Solomon Four-Group design
fit_solomon_ml()
Full-information ML analysis for a Solomon Four-Group Design
perm_solomon()
Permutation test for a Solomon contrast
equivalence_solomon()
Equivalence test for a Solomon contrast
compare_solomon_methods()
Compare Solomon analyses and their estimands

Historical Solomon analysis

Classical procedures retained for teaching and methodological replication.

fit_solomon_classic()
Historical Solomon Four-Group Analysis
stouffer_solomon()
Stouffer's Z combiner (Braver & Braver, 1988, Test I)
p_to_z()
Convert p-value to Z (one-tailed) for Stouffer's method

Structural equation models

Observed- and latent-variable SEM approaches to the Solomon design.

fit_solomon_sem()
SEM analysis for Solomon Four-Group designs (mean-structure; optional ANCOVA)
fit_solomon_sem_latent()
Latent SEM for Solomon Four-Group designs (POST means; optional latent ANCOVA)

Design validation and diagnostics

Check design coding, cell structure, and missingness before analysis.

validate_solomon()
Validate the structure and coding of a Solomon four-group design
check_solomon_missing()
Distinguish structural and incidental missingness in a Solomon design
check_solomon_assumptions()
Descriptive assumption diagnostics for Solomon analyses
power_solomon()
Power simulation for Solomon designs
plan_solomon()
Sample-size planning for Solomon designs

Plotting

plot_solomon()
Plot Solomon Posttest Cell Means
plot_solomon_gg()
Plot Solomon Posttest Cell Means with ggplot2
plot_perm()
Plot permutation distribution for a Solomon contrast
plot_solomon_effects()
Forest plot of the Solomon contrasts
plot_sensitization()
Pretest sensitization figure
plot_solomon_design()
Schematic of the Solomon four-group design
plot_solomon_change()
Pretest-to-posttest change in a Solomon design
plot_classic_flow()
Historical Solomon decision path
plot_power_solomon()
Power curves for a Solomon design

Data

solomon_example
Simulated Solomon four-group study (primary example)
solomon_demo
Demo Solomon four-group data set (second example)

Package

solomonR
solomonR: Analyze Solomon Four-Group Designs