betareg (version 2.4-0)

CarTask: Partition-primed Probability Judgement Task for Car Dealership

Description

In this study participants were asked to judge how likely it is that a customer trades in a coupe or that a customer buys a car form a specific salesperson out of four possible salespersons.

Usage

data(CarTask)

source

Taken from http://dl.dropbox.com/u/1857674/betareg/betareg.html.

Details

All participants in the study were undergraduate students at The Australian National University, some of whom obtained course credit in first-year Psychology for their participation in the study.

The NFCC scale is a combined scale of the Need for Closure and Need for Certainty scales which are strongly correlated. For task the questions were: [object Object],[object Object]

References

Smithson, M., Merkle, E.C., and Verkuilen, J. (in press). Beta Regression Finite Mixture Models of Polarization and Priming. Journal of Educational and Behavioral Statistics.

Smithson, M., and Segale, C. (2009). Partition Priming in Judgments of Imprecise Probabilities. Journal of Statistical Theory and Practice, 3(1), 169--181.

Examples

data("CarTask", package = "betareg")
car_betamix <- betamix(probability ~ 1, data = CarTask, k = 3,
  extra_components = list(extraComponent(type = "uniform", coef = 1/2,
  delta = 0.01), extraComponent(type = "uniform", coef = 1/4, delta = 0.01)),
  FLXconcomitant = FLXPmultinom(~ task))