formula_tools: Tools for manipulating formulas

In rje42/causl: Methods for Specifying, Simulating from and Fitting Causal Models

Tools for manipulating formulas

Description

Tools for manipulating formulas

Usage

lhs(formulas, surv = FALSE)

lhs(formulas) <- value

rhs_vars(formulas)

tidy_formulas(formulas, kwd, prefix = "V")

Arguments

formulas	list of formulae
surv	logical indicating whether to treat as survey data
value	character vector to assign
kwd	string used to denote copula
prefix	string to begin each new variable name

Details

lhs returns a character vector containing left-hand sides of a list of formulae. If surv=TRUE then two responses are returned in the event of the left-hand side being a valid Surv object. ⁠lhs<-⁠ allows one to assign the left-hand sides of variables in the obvious way.

tidy_formulas ensures that all formulae in a list have a left hand side, by giving them names of the form Vn where n is some positive integer. The prefix V can be changed using the argument prefix.

rhs_vars extracts all the variables used on the right-hand sides of a list of formulas.

Functions

• lhs(): Obtain left-hand sides from list of formulas

• lhs(formulas) <- value: Assign left-hand sides to list of formulas

• rhs_vars(): Extract variables from right-hand sides

• tidy_formulas(): Tidy up formulae

rje42/causl documentation built on June 1, 2025, 2:50 p.m.