Hi Quin, the package 'drc' on CRAN deals with modelling dose-response curves.
Moreover it allows adjustment for heterogeneity by means of transformation (Box-Cox transformation) modelling the variance as a power of the mean. See the package documentation for more features. Christian ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
