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Hi, I would like to know what is the most efficient algorithm to compute precisely Mill's ratio for the normal distribution. I have to compute in a routine terms like (x^n)*exp(0.5*x^2)*(1-F(x)), where F is the normal pdf. These kind of terms are actually multiplied by other huge numbers and added or substracted. Therefore, i need a very precise algorithm. At the same time, i want to use the minimum possible of terms, since i have to do this kind of computations lots of times. Thank you for your help. JK _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp