I have recently uploaded a new package to CRAN called eba,
which stands for elimination-by-aspects models.
It allows for fitting and testing probabilistic choice models,
especially the BTL model (Bradley & Terry, 1952; Luce, 1959),
elimination-by-aspects (EBA) models (Tversky, 1972), and
preference tree (Pretree) models (Tversky & Sattath, 1979).
I believe that the functions in this package can be useful
in many fields, like marketing, consumer research, psychological
scaling, and food testing, to name only a few.
Detailed information about probabilistic choice models and
how to fit them can be found in a recent publication:
Wickelmaier, F. & Schmid, C. (2004). A Matlab function to estimate
choice model parameters from paired-comparison data. Behavior
Research Methods, Instruments, and Computers, 36(1), 29-40.
I would be glad to receive some feedback or comments.
---------------------------------------------------------------
Florian Wickelmaier
Dipl.-Psych., Research Assistant office: B5-209
Department of Acoustics phone: (+45) 9635 8720
Fredrik Bajers Vej 7 B5 fax: (+45) 9815 2144
DK-9220 Aalborg East e-mail: fw at acoustics.dk
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