| Title: | Create Subformulas of a Formula |
|---|---|
| Description: | A formula 'sub' is a subformula of 'formula' if all the terms on the right hand side of 'sub' are terms of 'formula' and their left hand sides are identical. Creation of subformulas from a parent formula is useful in for instance model selection. |
| Authors: | Jonas Moss [aut, cre] |
| Maintainer: | Jonas Moss <[email protected]> |
| License: | MIT + file LICENSE |
| Version: | 0.1.0 |
| Built: | 2025-02-05 05:56:36 UTC |
| Source: | https://github.com/jonasmoss/subformula |
fapply returns a list of the same length as formulas. Each element is
the result of applying modelthe the corresponding element of formulas.
fapply(formulas, model, ...)fapply(formulas, model, ...)
formulas |
a list of formulas or objects coercible to formula by stats::as.formula. |
model |
a function taking a |
... |
additional arguments to be passed to |
This is a member of the apply family. It is similar to
lapply, but handles the call slightly
differently. This makes the output prettier.
fapply returns a list of evaluated function calls.
formulas = subformula(mpg ~ cyl + disp, protected = ~ cyl) fapply(formulas, lm, data = mtcars) # Pretty output. lapply(formulas, lm, data = mtcars) # Less pretty output.formulas = subformula(mpg ~ cyl + disp, protected = ~ cyl) fapply(formulas, lm, data = mtcars) # Pretty output. lapply(formulas, lm, data = mtcars) # Less pretty output.
A formula sub is a subformula of formula if (i) all the terms
on the right hand side of sub are terms of formula and (ii)
their left hand sides are identical. subformula finds every
subformula of formula that contains each term in protected.
subformula(formula, protected = NULL, data = NULL)subformula(formula, protected = NULL, data = NULL)
formula |
an object of class " |
protected |
a vector or formula specifying which covariates are protected. Protected formulas appear in all subformulas. |
data |
an optional data frame (or object coercible by
|
Protected terms will appear in every subformula. If the supplied formula
includes the term 0 or -1, none of the subformulas will
include the intercept. Otherwise, the intercept will be interpreted as
being protected. If formula is is coerced to a formula
object, its associated environment will be
NULL. All subformulas will inherit their .Environment
attribute from formula.
subformula returns a list of formula objects.
subformula(z ~ x + y) subformula(y ~ x + y + y^2, protected = ~ x) subformula(y ~ x + y + t + I(t^2), protected = c("x","I(t^2)"))subformula(z ~ x + y) subformula(y ~ x + y + y^2, protected = ~ x) subformula(y ~ x + y + t + I(t^2), protected = c("x","I(t^2)"))