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 Fitting a power function to a scatter plot		  New Topic  Reply to Topic
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jefitre

Albania
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Posted - 11/23/2006 :  3:33:43 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hey all,

How do I fit a power function to a scatter plot. I have a scatter plot of fish weight VS fish length that is J-shaped but I would like to fit a power function that best describes the data. I tried the wizard under non-linear fit in Analysis but it connects several scatter points with separate lines instead of just fitting one J-shaped power function to the data. See image below.

Thanks in advance for your help.




Edited by - jefitre on 11/23/2006 3:42:04 PM

Edited by - jefitre on 11/23/2006 3:48:14 PM

Edited by - jefitre on 11/23/2006 3:56:32 PM

larry_lan

China
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Posted - 11/23/2006 :  10:30:57 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi:

You said "it connects several scatter points with separate lines instead of just fitting one J-shaped power function to the data", do you mean there is no fitted curve on your plot? I am not quite sure what's your problem, could you describe your steps in detail or use the Allometric1 and Allometric2 function on the Power category to fit your data again?

Larry
OriginLab Technical Services

Edited by - larry_lan on 11/23/2006 10:33:38 PM
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jefitre

Albania
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Posted - 11/24/2006 :  3:36:31 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hey,
Thanks. That is what I exactly did. I used the allometric 1 and Allometric 2 for fitting but got several lines instead of just one line. What I am doing wrong?
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larry_lan

China
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Posted - 11/24/2006 :  8:23:27 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi:

I try these fitting functions and OK by using some of my data, maybe you can sort your data before fitting, If it doesn't work, please send your OPJ to tech@originlab.com and we can have a try?

Thanks

Larry
OriginLab Technical Services

Edited by - larry_lan on 11/24/2006 8:30:11 PM
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