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2008 Jun 04
1
"& not meaningful for factors"
I am trying to define groupings from levels of factor variables and this the warning message that R give
"& not meaningful for factors".
The nature of my task is this. I have a variable stage which has the levels (1B, 2A, 2B) - these are the AJCC TNM stages of cancer, and another variable diameter with factor levels ("=< 4", "4 - 6.5, > 6.5; limit values are exclusive).
I am trying to define series of groupings based on these variables and others like them.
My first attempts were;
1. node1 <- data.trt[data.trt$...