Conjoint tasks

Random profile pairs (or k-tuples) over the supplied attributes, the design for a forced-choice conjoint. Profiles are sampled uniformly and independently per attribute; set a seed beforehand for a reproducible design (the function never sets one). At administration, fresh profiles are drawn independently for every respondent from the same attribute levels.

Usage

conjoint_design(attributes, n_tasks = 5L, profiles_per_task = 2L)

Arguments

attributes

Named list of level vectors.

n_tasks

Tasks per respondent.

profiles_per_task

Profiles shown per task (default 2).

Value

A conjoint_design list with fields profiles, a tibble containing task, profile, and one column per attribute, and attributes, the named list of attribute levels. Render it into forced-choice items with conjoint_instrument() and estimate with conjoint_amce() after administration. Profiles within a task are distinct when the attribute space permits them. When it does not, duplicates remain and a warning is issued.

Examples

set.seed(110)
conjoint_design(
  list(price = c("$10", "$20"), speed = c("slow", "fast")),
  n_tasks = 4)