Hi, 2008/8/21 Mario Maiworm <[EMAIL PROTECTED]>
> Hi, > I want to fit some psychophysical data with cumulative gaussians. There is > quite a convenient toolbox for matlab called 'psignifit' (formerly known as > 'psychofit'). It allows the lower bound of the sigmoid to vary slightly > from > zero, aswell as the upper bound to vary from one. with these two free > parameters, the fitted function is less sensitive to noisy data and > outliers. you might also check the function psyfun.2asym from the psyphy package http://cran.r-project.org/web/packages/psyphy/index.html best Víctor H > > Apart from advertising this toolbox I want to ask for possibilities in R to > fit psychometric functions, as I would rather use R than matlab. Is there a > comparable package specific for psychophysics in R? otherwise: which > function would be a good choice? Can I have functionality equal to > 'psignifit' with glm() from MASS. I would be grateful for some suggestions > of people who have experience in sigmoid-fitting in R. > Best, > Mario. > > > __________________________________________________________________ > > Mario Maiworm > Biological Psychology and Neuropsychology > University of Hamburg > Von-Melle-Park 11 > D-20146 Hamburg > > Phone: +49 40 42838 8265 > Fax: +49 40 42838 6591 > > http://bpn.uni-hamburg.de/Maiworm_e.html > http://cinacs.org > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
