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...(c ("YES","YES","NO","NO"),2),T2=rep(c("YES","NO","YES","NO"),2),Freq=c (12,5,0,7,24,1,0,0)) What do you think of such datas ? Can I use any statistical method to test my hypothesis ? Any advice ? Thanks, Etienne Toffin ------------------------------------------------------------------- Etienne Toffin, PhD Student Unit of Social Ecology Universit? Libre de Bruxelles, CP 231 Boulevard du Triomphe B-1050 Brussels Belgium Tel: +32(0)2/650.55.30 Fax: +32(0)2/650.57.67 http://www.ulb.ac.be/sciences/use/toffin.html

...w if there is any statistical method to compare the estimated values of parameters of the two distributions ? And wether it's the case, how to perform it in R ? Hope I'm clear enough for getting help, Etienne ------------------------------------------------------------------- Etienne Toffin, PhD Student Unit of Social Ecology Universit? Libre de Bruxelles, CP 231 Boulevard du Triomphe B-1050 Brussels Belgium Tel: +32(0)2/650.55.30 Fax: +32(0)2/650.57.67 http://www.ulb.ac.be/sciences/use/toffin.html

...me for other parameters…). Do you have any other idea ? Thanks, Etienne One short question about nls: are there any reason why nlm should be used rather than nls and vice-versa (nls results are quite more full than those of nlm)? > Hope this helps, > Spencer > > Etienne Toffin wrote: >> Hi, >> >> I'm using a non linear model to fit experimental survival curves. >> >> This model describes the fraction of "still active" experiments as >> a function of time t as follows: >> f(t)=(1+exp(-etaD*cD)) / (1+exp(etaD(t-cD))...

...on line to pass through origin with lm(y ~ x +0). However, R-squared values are higher in this case than when I compute the linear regression with lm(y ~ x). It seems to be surprising to me: is this result normal ? Is there any problem in the R-squared value calculated in this case ? Etienne Toffin

...This is not really a question about R but more about statistics? I don't think I'm really clear and I know I'm not rigorous at all in my descriptions, but I hope someone will understand me. Thanks, Etienne ------------------------------------------------------------------- Etienne Toffin, PhD Student Unit of Social Ecology Universit? Libre de Bruxelles, CP 231 Boulevard du Triomphe B-1050 Brussels Belgium Tel: +32(0)2/650.55.30 Fax: +32(0)/650.59.87 Skype: etienne_titou http://www.ulb.ac.be/sciences/use/toffin.html

Hi there, I've got a small question : is there any post-hoc test for Kruskal rank sum test integrated in R ? I know that the Nemenyi test is one of the post-hoc that can be used, but there's no (to by knowledge) R function for it. What should I do ? Thanks, Etienne

...the parameter that is compared (i.e. the 2 curve fits find the same value for the shared parameter). This point is where I need some help : is there any function to make non-linear fitting of (at least) 2 data sets with shared parameters ? Hope someone will have some good news for me… Etienne Toffin [[alternative HTML version deleted]]