It is meaningless to talk about "contributors" in the abstract without acknowledging that some projects have more full-time dedicated programmers, and others don't. Code size matters, yes. But so experience. And so does hours/week working on the project.
We're fortunate with Apache OpenOffice to have developers working on the code with experience dating back before Oracle, before Sun, back to the StarDivision days, as well as programmers with years of experience with IBM Lotus Symphony.
An interesting ratio to look at is the average commits/contributor. If you look at that and compare AOO and LO you will see nearly a 2:1 ratio. In other words, on average each of the AOO contributors does twice as many commits.
Whatever the reason for that (and I could imagine several theories) the fact that there is that disparity across two otherwise similar open source projects suggests it is hazardous to make comparisons based on naive application of statistics. You might use the word "commit" and "contributor" and think the mean the same thing in both projects, but if the ratio is that different, this suggests that these two populations are different in some other interesting ways.
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