You are correct that the survreg routine only supports 'rho' of the
Fleming-Harrington G-rho tests. This is a function of age -- I wrote the
original code back when I was working with Tom (Fleming), and he was only using
1 parameter. Later he and David expanded the test to two parameters. This
might be only the second request for the feature in the 30+ years since that
date.
Terry Therneau
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