You don't need optimization for the solution to your problem. You just need an understanding of the meaning of qnorm() and some simple algebra.
Try: x<- (0.01-0.0032)/qnorm(0.7,0,1) At 12:01 PM 6/18/2007, you wrote: >Hi, I would like to minimize the value of x1-x2, x2 is a fixed value of 0.01, >x1 is the quantile of normal distribution (0.0032,x) with probability of >0.7, and the changing value should be x. Initial value for x is 0.0207. I am >using the following codes, but it does not work. > >fr <- function(x) { > x1<-qnorm(0.7,0.0032,x) > x2=0.01 > x1-x2 >} >xsd <- optim(0.0207, fr, NULL,method="BFGS") > >It is the first time I am trying to use optimization. Could anyone give me >some advice? >-- >View this message in context: >http://www.nabble.com/Optimization-tf3941212.html#a11178663 >Sent from the R help mailing list archive at Nabble.com. > >______________________________________________ >R-help@stat.math.ethz.ch mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: [EMAIL PROTECTED] Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.