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3 results for “from:Stephen A Roberts”

Closed form for regression splines
Stephen A Roberts · Dec 5, 2005 · r-help

Greetings, I have a model fitted using bs() and need to be able to write down a closed form for the spline function to enable the use of the fitted model outside R. Does anyone know a simple way of...

Closed form for regression splines - solution
Stephen A Roberts · Dec 7, 2005 · r-help

Greetings, The question was about getting closed form equations from a bs() representation of a curve so enabling publication of a fitted curve for uise outside R. In case anyone else is interested, the solution lies in exploiting the fact...

OT Futility Analysis
Stephen A Roberts · Feb 22, 2006 · r-help

I would take the line that if they hadn't pre-specified any stopping rules, the only reason to stop is safety or new external data. I would be very suspicious of requests from the steering committee to stop for...

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