Dear Lynn, On Tue, 22 Jul 2014 13:59:39 +0200 Lynn Govaert <lynn.gova...@gmail.com> wrote: > Hi, > > I have a problem with doing a repeated measures ANOVA. I will first give > you an idea of what my dataset looks like. We have 20 ponds, and for each > pond we took some individuals (waterfleas), say 10 and tested them along > two treatments (A and B). Now, for each pond we also know the fish > background (Fish versus No Fish) and Land use intensity (High versus Low). > > Now, we measure the offspring of the first clutch and second clutch of each > individual, and we want to see if there is an effect of each of the other > factors (treatment, background, land use), so we need to do a repeated > measurement. > > So I rearranged my data where I put the first and second clutch in one > column, something like this: > > Ponds Treatment Background LandUse Clutch > SizeClutch > Pond1 A Fish High > 1 10 > Pond1 B Fish High > 1 15 > Pond2 A NoFish High > 1 8 > Pond2 B NoFish High > 1 11 > etc > Pond20 B Fish Low > 1 12 > Pond1 A Fish High > 2 15 > Pond1 B Fish High > 2 17 > Pond2 A NoFish High > 2 16 > Pond2 B NoFish High > 2 18 > etc > Pond20 B Fish Low > 2 11 > > So I made the Clutch variable myself, to separate between the different > clutches. > > I then performered the following analysis > > summary(aov(SizeClutch ~ Treatment*Background*LandUse + > Error(Clutch/Treatment*Background*LandUse) + Ponds , random = ~ Ponds| > Background*LandUse/Ponds)) > > This gives me something, but not exactly what I thought I would get. > I want to have results for > Ponds > LandUse > Background > Treatment > LandUse*Background > LandUse*Treatment > LandUse*Background*Treatment > > Clutch > Clutch*Ponds > Clutch*LandUse > Clutch*Background > Clutch*Treatment > Clutch*LandUse*Background > Clutch*LandUse*Treatment > Clutch*LandUse*Background*Treatment > > and p values for all of the effects. > Now, I don't know if it is possible to come to these results and if I'm > doing the repeated measure ANOVA correctly. Also, are there other ways to > do a repeated measurements in R?
For another approach to repeated-measures ANOVA (and MANOVA), see the section on repeated measures in the R Journal paper at <http://journal.r-project.org/archive/2013-1/fox-friendly-weisberg.pdf>. I hope this helps, John ------------------------------------------------ John Fox, Professor McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox/ > > Thanks in advance. > Lynn > > [[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. ______________________________________________ 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.
