Machinery for Processing Random Effect Formulas
Detect whether there are any 'specials' in a formula term
Expand terms with '||' notation into separate '|' terms
apply operator expansion (e.g. a/b -> a + a:b) to a formula term
list of specials -- taken from enum.R
Format columns corresponding to std. dev. and/or variance.
Format the 'VarCorr' Matrix of Random Effects
expand double-bar RE notation by splitting
Is f1 nested within f2?
Create list of structures needed for models with random effects
Drop 'specials' from a formula
Omit terms separated by vertical bars in a formula
Remove all random slopes from a formula, while retaining random interc...
extract right-hand side of a formula
Split formula containing special random effect terms
Substitute safe chars (+) for specials (for use in model.frame) (Gen...
"Substitute bars"
Takes formulas including random-effects components (formatted as in 'lme4', 'glmmTMB', etc.) and processes them. Includes various helper functions.