NEWS.md

In merDeriv: Case-Wise and Cluster-Wise Derivatives for Mixed Effects Models

merDeriv 0.2-6

Bug fixes

• vcov.lmerMod(full = TRUE) and estfun.lmerMod() returned the random effect (co)variance results in an order that did not match their labels when a random effect block was 3x3 or larger, so results depended on the order in which random effects were entered in the model formula (Github issue #2, reported by James Pustejovsky). The parameter index matrix is now built from Lambdat, which Lind actually indexes, instead of Lambda.

• vcov.lmerMod(full = TRUE, information = "observed") failed for REML fits because the internal Hessian entries were not coerced to numeric.

Other changes

• New regression tests covering Github issues #2 and #3, and updated lavaan model syntax (Github issue #4, reported by Yves Rosseel).

• Documentation fixes, including the bread.glmerMod() man page (contributed by Ben Bolker).

• Suggested packages (mirt, lmeInfo, nlme, smdata) are now used conditionally in tests, and the duplicated Suggests field in DESCRIPTION was merged.

merDeriv 0.2-5

• Released to CRAN 2025-06-12. Minor bug fixes.

Bug fixes

• estfun.glmerMod() and llcont.glmerMod() failed with "subscript out of bounds" when the cluster id variable was not a consecutive integer sequence starting at 1 (e.g., character ids or arbitrary numeric ids; Github issue #3, reported by teindor). Cluster rows are now looked up by name rather than by coerced numeric index.

• Internal class(x) == "..." comparisons were replaced with inherits(), avoiding "condition has length > 1" errors on R >= 4.2.0 for models whose family was specified as a function.

merDeriv 0.2-4

• Released to CRAN 2022-03-12. estfun.glmerMod() support for binomial and poisson families fit with glmer(), with scores of cluster-wise log-likelihoods computed via adaptive Gauss-Hermite quadrature.

merDeriv documentation built on July 17, 2026, 9:07 a.m.