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The goal of formulops is to assist with formula modification in R
treating formulae as standard mathematical operations as used with
nlme::nlme() and lme4::nlmer() (for treatment
as statistical formula see the Formula package).
You can install the released version of formulops from CRAN with:
install.packages("formulops")A few common examples of modifying a formula are given below.
library(formulops)
# Replace a with c in the formula
modify_formula(a~b, find=quote(a), replace=quote(c))
# Replace a with c+d in the formula
modify_formula(a~b, find=quote(a), replace=quote(c+d))
# More complex parts can be replaced, too
modify_formula(a~b/c, find=quote(b/c), replace=quote(d))
# Multiple replacements can occur simultaneously
modify_formula(a~b/c+d, find=list(quote(b/c), quote(d)), replace=list(quote(d), quote(e)))
# Function arguments can be expanded
modify_formula(a~b(c), find=quote(c), replace=quote(formulops_expand(d, e)))A substituting formula is a simple way to generate a complex formula from several simpler formulae. Parentheses are appropriately added, if required.
foo <- substituting_formula(y~x1+x2, x1~x3*x4, x2~x5/x6+x7)
as.formula(foo)These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.