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 Multi-Peak Fit Uses Negative Values		  New Topic  Reply to Topic
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Jordan Vandegrift

USA
2 Posts
Posted - 07/11/2016 :  7:10:44 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,

I am trying to use the Multi-Peak fit function with Origin Pro 8 to deconvolute my DSC data. On some of my plots, the fit is producing negative values when all of my data is positive. Is there a way to choose a minimum value for the fit to use so that it is not trying to utilize any negative values? Any help is appreciated! I have attached an image of what I am experiencing for reference.

Shirley_GZ

China
Posts
Posted - 07/11/2016 :  10:58:28 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Please try to create and subtract a baseline before doing peak fitting to correct the negative values.

You are suggested to use Peak Analyzer to do peak fitting with a baseline. More details, please refer to this tutorial:
http://www.originlab.com/doc/Tutorials/Create-Subtract-Baseline

If you just want to create a horizontal baseline line where Y= minimum, you can just select Constant for Baseline Mode in the Baseline Mode page:
http://www.originlab.com/doc/Origin-Help/CreateBaseline-PA

Thanks,
Shirley


Originlab Technical Service Team
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Jordan Vandegrift

USA
2 Posts
Posted - 07/12/2016 :  2:20:39 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Shirley,

I have tried subtracting/creating a baseline, however the fit is still below the value that I set as the baseline. For instance in the image in my original post, you can see that the tails of the green fit lines go below my original data. I would like to prevent this from happening. Do you have any further suggestions as to how I would accomplish this?

Thanks,
Jordan
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Shirley_GZ

China
Posts
Posted - 07/12/2016 :  10:56:59 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Please send us the whole project with all operations(including baseline treatment and peak fitting) via tech@originlab.com.

Please quote this post in you email and also provide the serial number of your Origin.

Thanks,
Shirley



Originlab Technical Service Team
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