Multi-Peak Fitting Problem in QtiPlot and OriginProt?

19 November 2018 1 9K Report

I have been trying to carry out Gaussian-type peak fitting of my data (XRD crystallinity probing of different starch types), using common fitting software, such as Igor, Origin Pro and QtiPlot, but I keep experiencing the same issue over and over again, which can be described by some of my peaks (total number of peaks = 10) being well fit, yet other fits appearing in places I have NOT selected as peak environments (see attached).

Note: Screenshots are from QtiPlot, but the same issue arises in OriginPro as well.

Any explanations and how I could possibly go about fitting my data? :( It would be MUCH appreciated.

Thank you in advance!

-Trey

Shahid Ali

Trey Todor Koev I have worked a lot on the different kinds of fitting. In this video, I have discussed the multiple peak fitting. How to customize a fitting equation or how to generate one’s own fitting equation. I have discussed in detail all the dependent variables. In the case you want to further ask about it, please do comment on the specific video, I'll respond to it shortly. I have provided the practice file(s) here. Thanks

https://youtu.be/ViIdEllu5pA

While, for other fittings, one may see as, like linear fitting (https://youtu.be/ViIdEllu5pA), polynomial fitting (https://youtu.be/JrL5ebTq5qM), nonlinear curve fitting (https://youtu.be/hkjsvbo6U30), exponential decay fitting (https://youtu.be/pdiOc86IZ6U), histogram fitting (https://youtu.be/cfW88FZzsyA), and Nonlinear fitting with constraints (https://youtu.be/XLdxjW1iQmc).

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