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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by wang2316@umn.edu[/i] [br]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! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.