If anyone wants to see a prime example of how inefficient it is to
program in SAS, take a look at the SAS programs provided by the US
Agency for Healthcare Research and Quality for risk adjusting and
reporting for hospital outcomes at
http://www.qualityindicators.ahrq.gov/software.htm . The PSSASP3.SAS
program is a prime example. Look at how you do a vector product in the
SAS macro language to evaluate predictions from a logistic regression
model. I estimate that using R would easily cut the programming time of
this set of programs by a factor of 4.
Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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