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2010 Sep 17
0
Merging data frames on a variety of columns
...?? identifier2 name other_name year H34 C56 ACME ACME_LTD 2001 H34 NA ACME ACME_LTD 2002 X20 C40 FOO_CO FOO_CO 2004 NA NA BAR_SA BAR_SAB 2004 NA NA BAR_SA BAR_SAB 2005 As you can see, many observations are missing values. I have a second data frame with information about these same companies, in fewer rows, and often with slightly different info... df2 <- identifier1 identifier...