[R] Aggregate to find majority level of a factor

From: Thompson, Jonathan <jonathan.thompson_at_oregonstate.edu>
Date: Thu, 31 May 2007 12:25:44 -0700

I want to use the aggregate function to summarize data by a factor (my field plots), but I want the summary to be the majority level of another factor.  

For example, given the dataframe:

Plot1     big
Plot1     big
Plot1     small
Plot2     big
Plot2     small    
Plot2     small
Plot3     small
Plot3     small
Plot3     small

My desired result would be:
Plot1 big
Plot2 small
Plot3 small

I can't seem to find a scalar function that will give me the majority level.

Thanks in advance,

Jonathan Thompson

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