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 A Question about Lognormal Fitting		  New Topic  Reply to Topic
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wang2316@umn.edu

1 Posts
Posted - 07/07/2015 :  7:40:03 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,

I have a question about log-normal fitting. I am using Originlab 9.1 (64bit, academic). I did a log-normal fitting, and I obtained Xc =114, w = 0.37. Now, I want to calculate SD.

I found this website:http://www.originlab.com/forum/topic.asp?TOPIC_ID=19913
I followed the equation SD=sqrt(exp(2a+b^2)(exp(b^2)-1)) where a=w, b=ln(Xc).

But it doesn't give me correct value of SD.

I wonder who can tell me how to calculate SD from Xc and w.

Thank you!

AmandaLu

439 Posts
Posted - 07/08/2015 :  06:34:20 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

This post is updated:

http://www.originlab.com/forum/topic.asp?TOPIC_ID=19913

Please refer to the last reply from Shirley.

Thanks,
Amanda
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