This question is related to a question I posted in the SAS/STAT forum ().
I have a large and sparse design matrix of ones and zeros (about 450k rows, 2500 columns). I'm trying to use this to run a regression, but SAS/STAT procedures are taking too long. (I ran proc hpmixed and it had not produced any results after 24 hours.)
If I read the data into Matlab as a sparse matrix, I can run a QR decomposition and invert the resulting matrix in less than 10 seconds. Is it possible to take this approach in IML? I feel like I must be missing something because it doesn't seem like this is a hard problem to solve, so I thought SAS would handle everything on the fly, but it seems that I'm going wrong somewhere.
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