cbc_overlap {cbcTools}

Counts of attribute overlap

Description

This function prints out a summary of the amount of "overlap" across attributes within the choice questions. For example, for each attribute, the count under "1" is the number of choice questions in which the same level was shown across all alternatives for that attribute (because there was only one level shown). Likewise, the count under "2" is the number of choice questions in which only two unique levels of that attribute were shown, and so on.

Usage

cbc_overlap(design)

Arguments

design

A data frame of a survey design.

Value

Prints the counts of the number of choice questions that contain the unique number of levels for each attribute.

Examples

library(cbcTools)

# A simple conjoint experiment about apples

# Generate all possible profiles
profiles <- cbc_profiles(
  price     = c(1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5),
  freshness = c("Excellent", "Average", "Poor"),
  type      = c("Fuji", "Gala", "Honeycrisp")
)

# Make a randomized survey design
design <- cbc_design(
  profiles = profiles,
  n_resp   = 300, # Number of respondents
  n_alts   = 3, # Number of alternatives per question
  n_q      = 6 # Number of questions per respondent
)

# Inspect the design balance
cbc_balance(design)

# Inspect the design overlap
cbc_overlap(design)