Not bioinformatics in itself, but I am running increasingly often to find the shortest path between to bioinformaticians, in terms of publications. If they are co-author on the same paper, their distance is zero. If they they are not found as co-author on a single paper, but both co-author a publication with a third author, then the index becomes one, etc. This idea is know as the Erdős index. Basically, I would like to calculate such index for any author, such as Lindenbaum (or should I exemplify Saunders now? :).
Despite the fun character of this index, my use case is very serious. I am editing a BMC Thematic Series, and need to know how 'close' a potential referee is to the authors of a paper.
I was wondering how high you think the index for a good reviewer should be. You probably think 0 is too low (i.e. they should not have co-authored a previous papers. But I would guess that if it is larger than 3 it is probably not really an expert on the topic. Also you might want to consider to exclude so called conceptual papers (where ideas or organizations are announced) or papers about standards from your analysis, since for these larger groups of authors are often sought that do not necessarily really collaborate on anything else.
Good points. Note that I do in fact review papers of others with index = 0. We're all grown up, and can objectively review work my befriended researchers, as long it is not work I collaborated on or advised for already.