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20200210
2010 Sep 17
0
Merging data frames on a variety of columns
...h my goal?
Also, for some reason when I do merges like m3, my resulting data
frame is missing columns and I am getting rows that do not appear to
match on the variables I have specified, e.g. ...
year other_name identifier1 name
identifier2
2001 AMDOCS_LTD G0260210 AMDOCS_LTDED C000042913
Help is much appreciated,
Chris