make_env_formula()

make_env_formula

R Documentation

Make Environmental Formula

Description

Creates a formula for environmental variables from abiotic data. If an ‘age’ column is present and ‘use_age = TRUE’, creates interaction terms between age and other variables. When ‘use_age = FALSE’, age is excluded from the formula even if the column exists in ‘data’.

Usage

make_env_formula(data, use_age = TRUE)

Arguments

data

A data frame containing abiotic environmental variables. Must have at least one column and one row.

use_age

Logical scalar. If ‘TRUE’ (default) and an ’age’ column is present in ‘data’, produces an interaction formula ‘~ (var1 + var2 + …) * age - age’. If ‘FALSE’, age is stripped from the formula regardless of its presence in ‘data’, producing a simple additive formula ‘~ var1 + var2 + …’.

Details

The function constructs different formulas based on the presence of an ‘age’ column and the ‘use_age’ flag: - With age column and ‘use_age = TRUE’: ~ (var1 + var2 + …) * age - age - Without age column, or ‘use_age = FALSE’: ~ var1 + var2 + … The formula removes intercept terms and individual variable terms when interactions are present.

Value

A formula object suitable for modeling. If ‘age’ is present and ‘use_age = TRUE’, returns a formula with interaction terms (age * variables). Otherwise, returns a simple additive formula. All formulas exclude intercept terms.