| T O P I C R E V I E W |
| Jordan Vandegrift |
Posted - 07/11/2016 : 7:10:44 PM
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. |
| 3 L A T E S T R E P L I E S (Newest First) |
| Shirley_GZ |
Posted - 07/12/2016 : 10:56:59 PM
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 |
| Jordan Vandegrift |
Posted - 07/12/2016 : 2:20:39 PM
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 |
| Shirley_GZ |
Posted - 07/11/2016 : 10:58:28 PM
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 |
