Dear Colleagues, I am interested to calculate time to 50 percentage for count data. I am working on soil seed bank germination. I have recorded number of seedling emergence in 10 different times for species. The total number of seeds in soil is not known therefore it is not proportional data but we can argue that after this period all viable seeds already germinated(total seedling emergence).
I am familiar with drc package for calculation T50 but only for proportional data like germination in petridishes which total number of seed in each pteridishes is known T50 could be calculated. Could we calculate T50 for count data as well? because we have total seedling emergence in the end, therefore their distribution during time is important and having this index we can find when species germinate ... This indices could be useful for other count data specially survival studies. warm regards Mehdi *Mehdi Abedi Department of Range Management* *Faculty of Natural Resources & Marine Sciences * *Tarbiat Modares University (TMU) * *46417-76489, Noor* *Mazandaran, IRAN * *mehdi.ab...@modares.ac.ir <mehdi.ab...@modares.ac.ir>* *Homepage <http://www.modares.ac.ir/en/Schools/nat/Academic_Staff/~mehdi.abedi>* *Tel: +98-122-6253101 * *Fax: +98-122-6253499* [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology