Challenge - Cohesive blocking

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Peter McMahan

to Doug 14:32, 3 July 2008 (PDT)

Hi Doug, I haven't had a chance to look too deeply into this, but I did try to run the example and it was not a fast result. The code seems to be running as it should, and when I kill it a few minutes in it's just at a point deep in its recursion... I'll give it some more thought later, but for now I would guess that it could be a simple efficiency issue of R vs SAS. I've thought about reimplementing it in R without using recursion (not R's strong point), but that's not something I could take on in the immediate future. But again, I'm not sure where the holdup is with this example. I'll try to give it a deeper look over the next couple weeks as my summer calms down. Thanks for finding this, Peter

Here is the (right click and save) full set of programs that James Moody is release into the public domain -- his SAS program for cohesive blocking Doug 14:36, 3 July 2008 (PDT)

Do we want to outsource (I have funds for this) to a place like Data art in Russia @ ?

Back to Talk:Structural Cohesion - the problem was fixed Doug 21:16, 31 August 2009 (PDT)

Scott D. White's advice: Knowing now that Peter has done an R version, it is much much easier to go from R to Matlab than from SAS to Matlab: there must be 100,000 programmers who know R and Matlab.

Natasa Kejzar knows both.