Hi Keith, it seems like a good starting position. I recommend that you spend some time studying Pinheiro and Bates's book to see where t ogo from here.
Cheers Andrew On Mon, Oct 22, 2007 at 02:58:51PM -0800, Keith Cox wrote: > I have three columns of data, Xc, Trt and fish. This was a repeated > measures design with 6 measurements taken from each of 5 fish. Xc is the > actual measurement, Trt is the treatment, and fish is the fish number. Data > can be seen below (hopefully it is in the column format). I would like to > look for differences between treatments in a repeated measures format. I > used the following code > > > > library(nlme) > > > > summary(lme(Xc~trt,data=R.exp,random=~1|fish)) > > > > This seems to work and I would like to know if > > > > 1) this is the right function for my question, if so, then > > 2) in the summary, value is the first column, but what value is this. I > have searched in vain and cannot find the answer. Any help or links to > examples would be appreciated greatly. > > Fixed effects: Xc ~ trt > > Value Std.Error DF t-value p-value > > (Intercept) 103.62 2.619657 20 39.55480 0 > > trtB -33.28 1.991197 20 -16.71356 0 > > trtC -39.38 1.991197 20 -19.77705 0 > > trtD -32.60 1.991197 20 -16.37206 0 > > trtE -47.32 1.991197 20 -23.76460 0 > > trtF -39.58 1.991197 20 -19.87749 0 > > > > > Xc > > Trt > > fish > > > 109.1 > > a > > 1 > > > 73 > > b > > 1 > > > 68.4 > > c > > 1 > > > 74.8 > > d > > 1 > > > 60.3 > > e > > 1 > > > 57 > > f > > 1 > > > 106 > > a > > 2 > > > 72.3 > > b > > 2 > > > 67 > > c > > 2 > > > 70.6 > > d > > 2 > > > 58.2 > > e > > 2 > > > 66.2 > > f > > 2 > > > 102 > > a > > 3 > > > 67.1 > > b > > 3 > > > 61 > > c > > 3 > > > 68.4 > > d > > 3 > > > 50.2 > > e > > 3 > > > 64.7 > > f > > 3 > > > 105 > > a > > 4 > > > 76.6 > > b > > 4 > > > 68.8 > > c > > 4 > > > 77.7 > > d > > 4 > > > 61.8 > > e > > 4 > > > 75.7 > > f > > 4 > > > 96 > > a > > 5 > > > 62.7 > > b > > 5 > > > 56 > > c > > 5 > > > 63.6 > > d > > 5 > > > 51 > > e > > 5 > > > 56.6 > > f > > 5 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Marlin Keith Cox Ph.D. > > At-Sea Processor Professorship of Fisheries Biology > Science Chair > > Sheldon Jackson College > > Sitka, Alaska 99835 > > 907.747.5296 > > http://www.sheldonjackson.edu > > > > > [[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. -- Andrew Robinson Department of Mathematics and Statistics Tel: +61-3-8344-9763 University of Melbourne, VIC 3010 Australia Fax: +61-3-8344-4599 http://www.ms.unimelb.edu.au/~andrewpr http://blogs.mbs.edu/fishing-in-the-bay/ ______________________________________________ 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.
