New packages psyphy and MLDS are available on CRAN:
psyphy ncludes an assortment of functions
useful in analyzing data from pyschophysical experiments. It
includes functions for calculating d' from several
different experimental designs, links for mafc to be
used with the binomial family in glm (and possibly
other contexts) and selfStart functions for estimating gamma values
for CRT (and possibley other RGB) screen calibration data.
MLDS implements analyses for Maximum Likelihood Difference Scaling.
Difference scaling is a method for scaling perceived super-threshold
differences. The package contains functions that allow the user to fit
the resulting data by maximum likelihood and to test the internal
validity
of the estimated scale. There are also example functions that might
be used to design and run a difference scaling experiment,
Any suggestioins, criticisms, bug-reports, etc. are always welcome.
Best,
Ken Knoblauch
--
Ken Knoblauch
Inserm U846
Institut Cellule Souche et Cerveau
D?partement Neurosciences Int?gratives
18 avenue du Doyen L?pine
69500 Bron
France
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
http://www.pizzerialesgemeaux.com/u846/
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