[R] how to combine two data frames via factors (or somehow else)

From: Philipp Chapkovski <chapkovski_at_gmail.com>
Date: Mon, 30 May 2011 00:51:12 +0400

The question should be very naive, but I am a beginner and stuck with this unfortunately.
There is a dataset of people's affiliation to companies that looks like that (a data frame actually)
  x y
1 a X
2 b X
3 c X
4 f Z
5 e Z
6 g Z
where x is a name of a person and y is a company name. That is, a,b,c work in a company X. f,e,g work in a company Z.

and there is another dataset with the affiliation of companies. Like that (much much longer in reality):
  y1 y2
1 X W
2 Z W
that means that both X and Z belongs to the same company W. What is the most compact way (without loops etc) to 'attach' the 'head company' from the second dataset to the first dataset so I can have something like:

  x y owner
1 a X W
4 f Z W

I know it should be done somehow with factors, but I don't know how. Thank you in advance!

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sun 29 May 2011 - 21:07:21 GMT

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