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sample_1
2012 Apr 21
2
using "factor" to eliminate unused levels without dropping other variables
...that one or some
of you can help.
Here is the code I am trying to use:
#importing data
data.file <-read.csv("/file/location", header=TRUE, sep = ",")
#selecting a subset of data based on variable "Sample"
data.subset1 <- subset(data.file, subset=(Sample !='sample_x' &
Sample !='sample_y')).
**This leaves me a data file that has 8 levels of the variable
"Sample" and 2 empty levels that correspond to sample_x and sample_y.
I need to get rid of these two levels for plotting purposes, so I
tried using the code below...
data.subset2 <...