[R] [R-pkgs] updated package eba 1.4-0

2005-05-07 Thread Florian Wickelmaier 
Dear all,

There is an updated version of the eba package for
elimination-by-aspects (EBA) choice models available on CRAN.

It features new functions for extracting and plotting
the residuals, for testing hypotheses on the parameters
(wald.test), and for comparing sub-samples (group.test).
The documentation has also been updated.
Any feedback is welcome.

Happy modeling!

Florian Wickelmaier

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[R] [R-pkgs] New package: eba

2004-08-11 Thread Florian Wickelmaier 
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 Acousticsphone: (+45) 9635 8720
 Fredrik Bajers Vej 7 B5fax: (+45) 9815 2144
 DK-9220 Aalborg East   e-mail: [EMAIL PROTECTED]

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