compatible.formula.terms | R Documentation |
162,660
pairs of compatible terms for building model formulas with up to 15
fixed effects.
A data.frame
with 162,660
rows and 5
variables:
term, fixed effect or interaction, with fixed effects separated by "*
"
term, fixed effect or interaction, with fixed effects separated by "*
"
maximum interaction size in the two terms, up to 3
number of unique fixed effects in the two terms, up to 5
minimum number of fixed effects required to use a formula with the two terms,
i.e. the index in the alphabet of the last of the alphabetically ordered effects (letters) in the two terms,
so 4
if left == "A"
and right == "D"
A term is either a fixed effect or an interaction between fixed effects (up to three-way), where
the effects are separated by the "*
" operator.
Two terms are compatible if they are not redundant,
meaning that both add a fixed effect to the formula. E.g. as the interaction
"x1 * x2 * x3"
expands to "x1 + x2 + x3 + x1 * x2 + x1 * x3 + x2 * x3 + x1 * x2 * x3"
,
the higher order interaction makes these "sub terms" redundant. Note: All terms are compatible with NA
.
Effects are represented by the first fifteen capital letters.
Used to generate the model formulas for combine_predictors
.
Ludvig Renbo Olsen, r-pkgs@ludvigolsen.dk
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