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Dear all, I have partial data set with four colums. First column is "site" with three factors (i.e., A, B, and C). From second to fourth columns (v1 ~ v3) are my observations. In the observations of the data set, "." indicates missing value. I replaced "." with NA. To replace "." with NA, I used two steps. First, I replaced "." with NA, and

...in df2. Df1 >has more firm/year rows than df2, and them don't match with none in df2. That is what you believe but it seems that R disagrees. I imagine the dataframes are too big to post so what I would try first is to create new dataframes containing just the variables firm and year (say newdf1 and newdf2), merge them and see whether I got the expected number of rows. If I did then I would add other variables back into the dataframe until the problem re-appeared. >Cec?lia > >Em Sun, 22 Aug 2010 12:09:57 -0500 > Erik Iverson escreveu: >>Cecilia - >>Find what col...