| anySpecial | Detect whether there are any 'specials' in a formula term |
| expandDoubleVerts | Expand terms with "||" notation into separate "|" terms |
| expandGrpVar | apply |
| findReTrmClasses | list of specials - taken from enum.R |
| formfuns | expand double-bar RE notation by splitting |
| isNested | Is f1 nested within f2? |
| mkReTrms | Create list of structures needed for models with random... |
| nobars | Omit terms separated by vertical bars in a formula |
| no_specials | Drop 'specials' from a formula |
| RHSForm | extract right-hand side of a formula |
| splitForm | Split formula containing special random effect terms |
| subbars | "Substitute bars" |
| sub_specials | Substitute safe chars (+) for specials (for use in... |
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