Erik Iverson ha scritto:
This really has nothing to do with the "row names" issue you mention, as far as I can tell. It has to do with this:
http://stackoverflow.com/questions/1195826/dropping-factor-levels-in-a-subsetted-data-frame-in-r
Best,
Erik Iverson
Perhaps you may also take a look at this
http://wiki.r-project.org/rwiki/doku.php?id=tips:data-manip:drop_unused_levels
df.mydata$problemFactor <- df.mydata$problemFactor[, drop = TRUE]
8rino
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