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lme4pureR

The penalized least squares (PLS) and penalized iteratively reweighted least squares (PIRLS) algorithms from lme4, but written entirely in pure R. The purposes of this package are:

  1. clarify how PLS and PIRLS work without having to read through C++ code,

  2. as a sandbox for trying out modified versions of PLS and PIRLS,

  3. as a companion to manuscripts describing the lmer and glmer functions.

Note: Currently, this branch of lme4pureR depends on the flexLambda branch of lme4.