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 Nonlinear curve fitting - Sigmoidal

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malickfiaz Posted - 07/07/2016 : 10:47:33 PM
Origin Pro 9.1.0 b215 (Windows 10 x64)

Hi, how can I make a graph having linear fit curve for each data set
In the example uploaded graph has six data sets, how can I have sigmoidal curve for each one,
Regards,

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malickfiaz Posted - 07/11/2016 : 8:36:48 PM
Thank you Yuki.
Regards,

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yuki_wu Posted - 07/08/2016 : 03:41:20 AM
Hi,

If you want to have sigmoidal curve for your dataset, you should select a reasonable function and set its parameters before fitting. For sigmoidal curve, you can select the functions from Category: Growth/Sigmoidal.



Here is a page about four sigmoidal models that you can refer to:
http://www.originlab.com/doc/Origin-Help/Fitting-Sigmoidal

If you want to fit multiple datasets and have fitted curve for each dataset, you can select Multi-Data Fit Mode: Independent-Separate Report, and then add datasets easily in the fit dialog.



More details of how to fit multiple datasets can be found this FAQ:
http://www.originlab.com/doc/Quick-Help/Multi-Dataset-Fitting


Yuki
OriginLab Technical Service

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