[R] help with strip.default

From: Steven Lacey <slacey_at_umich.edu>
Date: Sat 07 Jan 2006 - 03:20:13 EST


I am creating a multi-conditioned trellis plot. My data look something like this:  

Factor A Factor B IV DV

X           1               
X           2
X           3
X           4  
Y           1
Y           2
Y           3
Y           5 
Z           1
Z           2
Z           3
Z           4

In one sense these data are suitable for trellis because for every level of factor A there are four levels of factor B. However, the names of the factor B levels depend on the level of factor A.  

How would I create a 3 x 4 trellis plot where each panel is a combination of factor A and factor B where the names of factor B are preserved and the strip has two levels, one for factor A and another for factor B?  

This was more difficult than I thought because trellis wants to generate 15 panels, as there are 3 levels of factor A and 5 levels of factor B. But these 5 levels of factor B are in name only. There are only 4 different levels of factor B for each level of factor A.  

As a work around I am considering renaming the levels in factor A from 1 to 4 for all levels of factor B. Then, write a custom strip.default to specify the names. However, I am not sure how to write this function. Would someone help me get started?  


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