This function returns a restricted set of profiles as a data frame.
cbc_restrict(profiles, ...)A data frame in which each row is a possible profile.
This can be generated using the cbc_profiles() function.
Any number of restricted pairs of attribute levels, defined as
pairs of logical expressions separated by commas. For example, the
restriction type == 'Fuji' & freshness == 'Poor' will eliminate profiles
such that "Fuji" type apples will never be shown with "Poor" freshness.
A restricted set of profiles as a data frame.
library(cbcTools)
# Generate all profiles for a simple conjoint experiment about apples
profiles <- cbc_profiles(
price = c(1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5),
type = c("Fuji", "Gala", "Honeycrisp"),
freshness = c('Poor', 'Average', 'Excellent')
)
# Obtain a restricted subset of profiles based on pairs of logical
# expressions. The example below contains the following restrictions:
# - `"Gala"` apples will not be shown with the prices `1.5`, `2.5`, & `3.5`.
# - `"Honeycrisp"` apples will not be shown with prices less than `2`.
# - `"Honeycrisp"` apples will not be shown with the `"Poor"` freshness.
# - `"Fuji"` apples will not be shown with the `"Excellent"` freshness.
profiles_restricted <- cbc_restrict(
profiles,
type == "Gala" & price %in% c(1.5, 2.5, 3.5),
type == "Honeycrisp" & price > 2,
type == "Honeycrisp" & freshness == "Poor",
type == "Fuji" & freshness == "Excellent"
)