[R] levels in dataframes

From: Georg Ehret <georgehret_at_gmail.com>
Date: Tue, 22 Apr 2008 16:57:54 -0400

Dear R community, I wish to ask a short question concerning factor-data in dataframes: When I subset the data and get rid of all data for one level, I still retain the level name (obtained by levels(dataframe$variablename) ). Is there a convenient way to get rid of the levels for which all data has been deleted?
Thank you and wishing you an excellent day! Georg.

Georg Ehret
Johns Hopkins
Baltimore, US

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