Dear R-users, I did some more research and I'm still not sure how to set up an ANCOVA with nestedness. Specifically I'm not sure how to express chicks nested within boxes. I will be getting Pinheiro & Bates (Mixed Effects Models in S and S-Plus) but it will not arrive for another two weeks from our interlibrary loan.
The goal is to determine if there are urbanization (purban) effects on chick health (rtot) and if there are differences between sexes (sex) and the effect of being in the same clutch (box). The model is rtot = sex + purban + (chick)box. I've loaded the package lme4. And the code I have so far is bb <- read.csv("C:\\eabl\\eabl_feather04.csv", header=TRUE) bb$sex <- factor(bb$sex) rtot.lme <- lme(bb$rtot~bb$sex, bb$purban|bb$chick/bb$box, na.action=na.omit) but this is not working. Any suggestions would be greatly appreciated. Thanks, Jeff **************************************** Jeffrey A. Stratford, Ph.D. Postdoctoral Associate 331 Funchess Hall Department of Biological Sciences Auburn University Auburn, AL 36849 334-329-9198 FAX 334-844-9234 http://www.auburn.edu/~stratja ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html