search for: grouping1

Hi Folks, I have data with a format like: ID y param1 param2 groupingFactor1 groupingFactor2..... 1 ... 1 1 1 2 2 2 2 3 3 3 so several grouping factors and repeated measures. I am using trellis and xyplot to get plot with several grouping factors. something like xyplot(y~x|grouping1*grouping2, data=na.omit(mydata), panel=function{panel.xyplot(x,y);....}); Lets say x is the x axis parameter and y the one for y. So this will produce a plot with 4 windows which groups data according to all combinations of groupingFactor1 and groupingFactor2. Now I want to label the data points i...

...the mean. However there are also some factor-variables in the data-frame that are not grouping variables and I actually would like to aggregate these variables with the unique() function. Is that possible with the standard aggregate-function? If I use it like this: aggregate(data, by=list(data$grouping1, data$grouping2), FUN=mean) I get vectors of NAs for the other factor-variables in the data.frame. But I actually want the unique value ? Is that possible? thanks!

In the non linear mixed effects package a groupedData object can be created to facilitate modeling. The gD object includes a formula of the form 'response variable' ~ 'primary covariate' | 'grouping factor'. In experiments creating response surfaces there are 2 or more primary covariates. Is there any way to use the groupedData() function to include 2 primary