Re: [R] How to do log normal regression?

From: Spencer Graves <spencer.graves_at_pdf.com>
Date: Thu 25 Aug 2005 - 14:18:48 EST

  1. Have you considered "nls" or "optim"? The documentation for both includes useful examples.
  2. What do your Y values represent? The almost universal standard today is maximum likelihood estimation. If you tell us what the Y values are, someone might help you write a likelihood function that could then be maximized using "optim".
  3. I notice this is the third post I've answered for you in the past month. I've been so busy recently, I tend to limit myself only to posts that are several days old for which I have not seen a reply. I believe you might get quicker and more useful replies to your questions if you please read and try to follow the posting guide! "http://www.R-project.org/posting-guide.html".
	  Good luck.
	  spencer graves

Haibo Huang wrote:

> I want to fit a Log-Normal CDF function between two
> variables, and estimate the parameters. Is there any
> package/functions designed for this purpose?
>
> Basically, I have data for Y and X, and I suspect the
> relationship between Y and X is Y = CDF Log-Normal
> (X), and I want to run this regression to verify this
> and estimate the parameters. Anyone has any thoughts?
>
> Any input is valuable to me, so please do not hesitate
> to share your thoughts. Thank you!
>
> Ed.
>
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-- 
Spencer Graves, PhD
Senior Development Engineer
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Received on Thu Aug 25 14:32:47 2005

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