formula_ops: Formula operations and coercion.

In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

Formula operations and coercion.

Description

Formula operations and coercion as a supplement to update.formula()

Usage

formula_add_str(frm1, terms, op = "+")

formula_add(frm1, frm2)

formula_poly(chr1, n, noint = FALSE, y = NULL)

formula_nth(frm1, n)

formula_to_interaction_matrix(frm1)

formula_chr_to_form(rhs, lhs = character(0))

to_str(chr1, collapse = "+")

terms_labels(frm1)

simplify_rhs(object)

## S3 method for class 'formula'
simplify_rhs(object)

## S3 method for class 'character'
simplify_rhs(object)

as_rhs_frm(object)

as_lhs_frm(object)

as_rhs_chr(object, string = FALSE)

as_lhs_chr(object, string = FALSE)

unique_formula(list_of_formulas)

Arguments

frm1, frm2	Formulas to be coerced to character vectors.
terms	Character string.
op	Either "+" (default) or "-".
chr1	Character vector to be coerced to formulas.
n	Positive integer.
noint	Boolean.
y	Response
rhs, lhs	right-hand-side and left-hand-side for formula (as characters)
collapse	Character to use as separator.
object	Character vector or formula.
string	Boolean.
list_of_formulas	list of formulas

Examples

formula_poly("z", 2)
formula_poly("z", 2, noint=TRUE)

as_rhs_chr(c("a", "b", "z"))
as_rhs_chr(c("a*b", "z"))

as_rhs_chr(y~a+b+z)
as_rhs_chr(y~a+b+z, string=TRUE)
as_rhs_chr(y~a+b+z)
as_rhs_chr(y~a*b+z)
as_rhs_chr(y~a*b+z, string=TRUE)

as_lhs_chr(y~a*b+z)
as_lhs_chr(log(y)~a*b+z)      ## Not what one might expect
as_lhs_chr(cbind(y, u)~a*b+z) ## Not what one might expect

formula_chr_to_form(c("a*b", "z"))
formula_chr_to_form(c("a*b", "z"), "y")
formula_chr_to_form(c("a*b", "z"), "log(y)")

formula_add(y~a*b+z, ~-1)
formula_add(y~a*b+z, ~a:b)

formula_add_str(y~x1 + x2, "x3")
formula_add_str(y~x1 + x2, "x1")
formula_add_str(y~x1 + x2, "x1", op="-")

doBy documentation built on Oct. 8, 2024, 1:06 a.m.