prefmod-package {prefmod}R Documentation

Utilities to fit paired comparison models for preferences

Description

Generates design matrix for analysing real paired comparisons and derived paired comparison data (Likert type items / ratings or rankings) using a loglinear approach. Fits loglinear Bradley-Terry model (LLBT) exploting an eliminate feature. Computes pattern models for paired comparisons, rankings, and ratings. Some treatment of missing values (MCAR and MNAR).

Details

Package: prefmod
Type: Package
Version: 0.8-13
Date: 2008-12-11
Depends: stats
License: GPL

Author(s)

Reinhold Hatzinger

Maintainer: Reinhold Hatzinger <reinhold.hatzinger@wu-wien.ac.at>

Examples

## mini example with three Likert items
## and two subject covariates

data(xmpl)   # example data in package
dsgnmat <- patt.design(xmpl, nitems = 3, resptype="rating",
    blnIntcovs = TRUE, cov.sel="ALL")
print(head(dsgnmat))

## fit of Critchlov & Fligner (1991) Salad Dressings Data
data(salad)
pattR.fit(salad, nitems=4)

# alternatively use glm() with patt.design()
sal<-patt.design(salad,nitems=4,resptype="ranking")
glm(y~A+B+C+D,family=poisson,data=sal)

[Package prefmod version 0.8-13 Index]