Description Format Details Author(s)

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:

- left
term, fixed effect or interaction, with fixed effects separated by "

`*`

"- right
term, fixed effect or interaction, with fixed effects separated by "

`*`

"- max_interaction_size
maximum interaction size in the two terms, up to

`3`

- num_effects
number of unique fixed effects in the two terms, up to

`5`

- min_num_fixed_effects
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, [email protected]

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