At least you could get reasonable starting values from qchisq. (If you also needed it to work in S-Plus, then you would need to port R's "qchisq" to S-Plus.)

Spencer Graves

Andrew Robinson wrote:
Greetings all,

I'm trying to figure out how to calculate the inverse CDF (i.e. a
quantile) for a non-central F distribution.  I could put together a quick
numerical solver routine using the CDF, but I wonder if there's a function
that I've missed that would be more efficient?

Thank-you,

Andrew

Andrew Robinson                      Ph: 208 885 7115
Department of Forest Resources       Fa: 208 885 6226
University of Idaho                  E : [EMAIL PROTECTED]
PO Box 441133                        W : http://www.uidaho.edu/~andrewr
Moscow ID 83843                      Or: http://www.biometrics.uidaho.edu
No statement above necessarily represents my employer's opinion.

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