> 1.The simple problem ist that i have different Samples , from > which i make repeated measurements (each sample is measured 6 > times) and i repeat this experiment over several Days, so i > get the lme grouping term "random=~1|Days/Sample".
I would rather specify this as: random= ~ 1 | Sample/Days, but I am not quite sure how this affects the model. > 2. Now i am measuring with 2 different measuring Apparatus > the same Sample each 6 times, to see how big the difference > from the appratus is. > Because Apparatus is on the level of repeated measurements i > cant write Days/Sample/Apparatus. the lme function offers a > list() feature to design the grouping, but i didnt understand > this, if it is the solution to the problem. Why would you want to include the Apparatus in the random effect? I assume that you are interested in differences and thus, this is a fixed effect: lme (fixed= response ~ apparatus, data= XX, random= ~ 1 | Sample/Days) Lorenz - Lorenz Gygax, [EMAIL PROTECTED] Centre for proper housing of ruminants and pigs Swiss Federal Veterinary Office ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
