Convenient Formula Generation

f.build() returns a formula of the form y ~ x1 + x2 + ... from a data frame input. It can be much quicker to use f.build() than to hand-write the precise formula, which may contain errors. It can be used in place of a formula in, for example, glm(), matchit(), or bal.tab(). It provides similar functionality to reformulate().

Usage

f.build(y = NULL, rhs = NULL)

Arguments

y

the quoted name of the response (left hand side) variable in the formula. Only one variable is supported. If missing, NULL, or the empty string (""), the formula will have no response variable. If rhs is not supplied, y will replace rhs and y will be set to "".

rhs

a data frame whose variable names will be the terms on the right hand side of the formula, or a character vector whose values will be the terms on the right hand side of the formula. If missing, the argument to y will replace rhs and y will be set to ""; in essence, f.build("x") is the same as f.build("", "x"), both producing ~ x.

Value

a formula object.

See also

reformulate()

Examples

data(lalonde)
covs <- subset(lalonde, select = -c(treat, re78))
#> Error in eval(substitute(select), nl, parent.frame()): object 'treat' not found
lm(f.build("treat", covs), data = lalonde)
#> Error in eval(mf, parent.frame()): object 'covs' not found