How to analyse data with two replicates per group
Dear all, Thanks in advance for your help. I will try to be precise, do not hesitate to tell me if you need more details. I have a dataset measuring some features of raptors eyes (let says here eye size for exemple). I have measured both eyes (left and right eyes) of 47 individuals. If I want to compare eye size with age and sex, what type of analysis should I use: 1) Should I analyse both eye separately (which can be interesting in term of vision)? 2) Can/should I analyse both eye together including Individual as a random effect? In other terms, I was wondering whether including individuals as random effect (with only two levels for each individual (left and right eye)) is possible? One more question, I want to compare the AIC of my models, but I get this error message: Warning message: In AIC.default(mm.edge, mm.edge2, mm.edge3) : models are not all fitted to the same number of observations I understand that the problem come from the fact that I have some NA in some fixed effect. How can I deal with this please because it is not possible to compare AIC? Best regards, Simon Potier
******************************************************* Simon Potier Department of Biology Lund University S?lvegatan 35 S-22362 Lund Sweden ******************************************************* phone +336 11 31 67 16 sim.potier at gmail.com https://www.simonpotier.fr ******************************************************* [[alternative HTML version deleted]]