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st: announcing statsbyfast - a faster statsby
Given a recent thread on Statalist about how slow statsby can be when
working with large panel datasets and some private email interest in some
code I had written to do faster bygroup regressions, I took the plunge and
re-worked the official Stata -statsby- command so that it uses the
faster -in- method of identifying by groups instead of the -if- method.
This approach provides all of the flexibility of statsby, but with a 6x-10x
speed improvement on larger panel datasets. The new ado -statsbyfast- is
now posted on SSC for downloading. statsbyfast is statsby with fewer than
10 lines of changed code and it works identically as far as I can tell.
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