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2010 Sep 17
0
Merging data frames on a variety of columns
...It's over 30,000 rows and looks
something like...
df1 <-
identifier1???? 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,...