Continued fraction approximation to a function and its derivative

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I am recently working on fitting a model with incomplete beta function. In order to put it into my optimization algorithm, I must find out the derivatives of the incomplete beta function $B_p(x,y)$ and program it into computer.

I don't know how to do this, but I found a paper on Journal of Statistical Software:

Boik, Robert J., and James F. Robison-Cox. "Derivatives of the incomplete beta function." Journal of Statistical Software 3.1 (1998): 1-20.

The method on it is amazing and perform quite well and fast. I wonder if it is possible to use the same way to approximate any "sufficiently nice" (log-)likelihood function and its derivatives directly?

May I ask:

Any good reference book / survey paper on this topic?