Am 14.09.2007 um 14:12 schrieb Petr PIKAL: > Hi > > [EMAIL PROTECTED] napsal dne 14.09.2007 13:50:58: > >> Birgit Lemcke wrote: >>> >>> Am 14.09.2007 um 12:05 schrieb Peter Dalgaard: >>> >>>> S Ellison wrote: >>>>> >>>>>>>> Peter Dalgaard <[EMAIL PROTECTED]> 14/09/2007 >>>>>>>> 09:26:16 >>> >>>>>>>> > > > <snip> > > >>>>> >>>> Yes, but.... >>>> >>>> I don't think lme() will do better than what you can do by hand: >>>> Get > two >>>> independent estimates of mu1-mu2 (one estimate from the pairs >>>> and one >>>> from the singlets), compute a weighted average using the s.e.'s and > test >>>> that against zero (possibly after testing them for equality for >>>> good >>>> measure). This is easy if you use a plug-in approach: first assume > that >>>> the s.e. are known, then plug in their empirical value. The tricky > bit >>>> is to calculate the DF in the style of Welch's test. >>> >>> I apologise but I really can not follow your >>> explanations. >>> I am R and Stastistics Beginner. >>> >>> What do you mean with mu1-mu2 and what are s.e.´s? >>> >> That was a reply to S. Ellison. If you don't understand it, don't >> worry; >> you'll probably need to read a book chapter or more about weighted >> analyses to get up to speed for that. >> >> mu1, mu2 : (theoretical) mean for group 1, 2 >> s.e.: standard error > > But as Birgit actually does not have any paired values, according > to the > data she had sent, she can not do paired t.test at all. The only > way is to > compare averages from each vector by non paired t.test or to get > some new > values for which she have counterparts. > > Regards > Petr > That is what I found out some hours ago. I thought about this problem and in my opinion it makes no sense to test the both vectors for significant differences, because I can not use another method for this vectors than for the other 24 vectors to test. To get new values is also not possible. And so I decided that I will not test this two vectors for significance because of too many missing values.
But I thank you all for your efforts to help me. Greetings Birgit > > >>> Once again thank you for your help. >>> >>> Birgit >>> >>> >>> >>> >>>> >>>> -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, > Entr.B >>>> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K >>>> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) >>>> 35327918 >>>> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) >>>> 35327907 >>>> >>>> >>> >>> Birgit Lemcke >>> Institut für Systematische Botanik >>> Zollikerstrasse 107 >>> CH-8008 Zürich >>> Switzerland >>> Ph: +41 (0)44 634 8351 >>> [EMAIL PROTECTED] >>> >>> >>> >>> >>> >>> >> >> >> -- >> O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B >> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K >> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) > 35327918 >> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) > 35327907 >> >> ______________________________________________ >> 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. > Birgit Lemcke Institut für Systematische Botanik Zollikerstrasse 107 CH-8008 Zürich Switzerland Ph: +41 (0)44 634 8351 [EMAIL PROTECTED] [[alternative HTML version deleted]]
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