mathijsdevaan <mathijsdev...@gmail.com> [Sat, Feb 12, 2011 at 03:00:18PM CET]:
>
> Hi,
>
> I have a dataset with info on individuals (B) that have been involved in
> projects (A) during multiple years (C). The dataset contains three columns:
> A, B, C. Example:
> A B C
> 1 1 a 1999
> 2 1 b 1999
> 3 1 c 1999
> 4 2 c 2001
> 5 2 d 2001
> 6 3 a 2004
> 7 3 b 2004
>
> I am interested in the average tenure of all individuals for each project
> (assuming that the tenure of an individual = 0 in the first project this
> individual is involved in). So based on the data above:
> A D
> 1 1 0
> 2 2 1
> 3 3 5
>
> where D = average project tenure. How do I do this?
>
I am not getting how you arrive at D calculating an "average".
Could you write down the arithmetic operations involved?
--
Johannes Hüsing There is something fascinating about science.
One gets such wholesale returns of conjecture
mailto:johan...@huesing.name from such a trifling investment of fact.
http://derwisch.wikidot.com (Mark Twain, "Life on the Mississippi")
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