Re: [R] Optimization

From: Robert A LaBudde <>
Date: Mon, 18 Jun 2007 12:38:16 -0400

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:
>Sent from the R help mailing list archive at
> mailing list
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail:
Least Cost Formulations, Ltd.            URL:
824 Timberlake Drive                     Tel: 757-467-0954
Virginia Beach, VA 23464-3239            Fax: 757-467-2947

"Vere scire est per causas scire" mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Mon 18 Jun 2007 - 16:47:16 GMT

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