[R] initial value for optim in polr question

From: <adschai_at_optonline.net>
Date: Sun, 10 Jun 2007 20:35:20 +0000 (GMT)


I have a problem with initial value for optim in polr that R report. After a call to polr, it complains that:

Error in optim(start, fmin, gmin, method="BFGS", hessian= Hess, ...) : initial value in 'vmin' is not finite.

Would you please suggest a way round to this problem? Thank you so much in advance.


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