[R] levels in dataframes

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

Re: [R] levels in dataframes

Peter Alspach -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Georg Ehret Sent: Wednesday, 23 April 2008 8:58 a.m. To: r-help Subject: [R] levels in dataframes Dear R community, I wish to ask a short question concerning factor-data