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...andle this integral. But since Phi has not cloaed form, I don't know how to do this effeciently. I appreciate very much if someone has any ideas about it. Thanks! Jeff -- View this message in context: http://r.789695.n4.nabble.com/how-to-use-quadrature-to-integrate-some-complicated-functions-tp3996765p3996765.html Sent from the R help mailing list archive at Nabble.com.