Thank you Santosh.

I am so new to R that I don't even have droplevels:
1> tcc2 = droplevels(tcc)
Error: could not find function "droplevels"

I looked up ?droplevels:
1> ?droplevels
No documentation for 'droplevels' in specified packages and libraries:
you could try '??droplevels'
1> ??droplevels
Help files with alias or concept or title matching ‘droplevels’ using
fuzzy matching:


gdata::drop.levels      Drop unused factor levels


Type '?PKG::FOO' to inspect entry 'PKG::FOO TITLE'.


However, droplevels is in the base package apparently, yet I haven't got it.
Can anyone explain this to me?

1> R.version
               _
platform       i486-pc-linux-gnu
arch           i486
os             linux-gnu
system         i486, linux-gnu
status
major          2
minor          10.1
year           2009
month          12
day            14
svn rev        50720
language       R
version.string R version 2.10.1 (2009-12-14)

Ben.




On 19 January 2011 19:27, Santosh Srinivas <santosh.srinivas@gmail.com>wrote:

> tcc.new2 <- droplevels(tcc.new)
>
>

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