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lsirm12pl 2.0.0 (2026-02-03)

Major Changes

• NEW: Added Graded Response Model (GRM) for ordinal/Likert-scale data
  • lsirmgrm(): 1PL GRM with latent space
  • lsirmgrm2pl(): 2PL GRM with item discrimination parameters
  • Supports complete data, MAR, and MCAR missing data mechanisms
  • Implements threshold ordering constraint (β₁ > β₂ > … > βₖ₋₁) for identifiability
  • Reference: De Carolis, Kang, & Jeon (2025), DOI: 10.1080/00273171.2025.2605678
• NEW: Adaptive MCMC algorithm
  • Automatic tuning of proposal standard deviations during burn-in
  • Parameter-specific target acceptance rates
  • Improved mixing and convergence for complex models
  • Available for all model types (1PL, 2PL, GRM)

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.