sasLM

sasLM computes type III sums of squares for linear models to reproduce SAS® PROC GLM/PROC REG/ANOVA statistical outputs.

Key Features:

• Compatibility with SAS® Procedures: Aligns computations with SAS® PROC GLM, PROC REG, and ANOVA procedures to match SAS® outputs.
• Type III Sum of Squares Calculation: Computes type III sums of squares (SS) for linear models to support analysis of nested and complex designs.
• Validation Against SAS® Standards: Validated against SAS® results using datasets from ten books and articles covering 194 models, producing identical results to SAS®.

Scientific Applications:

• Biostatistics: Analyzing biological data with nested designs where type III SS influences significance testing.
• Epidemiology: Performing analyses in studies that require robust variance component assessment affected by sum-of-squares type.
• Psychometrics and Social Sciences: Interpreting interaction effects in multifactorial experiments where type III SS is required.

Methodology:

Implements algorithms mirroring SAS® PROC GLM/PROC REG/ANOVA to compute type III sums of squares and reproduce ANOVA tables consistent with SAS® outputs.