Originlab - Area of the cummulative fit

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SUMMARY

The discussion centers on calculating the integrated area of a cumulative fit using OriginLab 9, specifically when dealing with two Lorentz functions that produce a third function. Users have noted that while OriginLab provides the area for individual fits, it does not directly calculate the area for the cumulative function. The concern arises from the fact that the individual fits may yield negative values, complicating the summation of areas. The key question is whether OriginLab 9 computes the mathematical area or the absolute area, impacting the accuracy of the cumulative area calculation.

PREREQUISITES
  • Understanding of Lorentzian functions and their properties
  • Familiarity with OriginLab 9 software and its area calculation features
  • Basic knowledge of integration and area under curves
  • Concept of absolute vs. mathematical area in data analysis
NEXT STEPS
  • Research how to calculate the integrated area of functions in OriginLab 9
  • Explore the differences between mathematical area and absolute area in data analysis
  • Learn about handling negative values in area calculations
  • Investigate the use of custom scripts in OriginLab for advanced area calculations
USEFUL FOR

This discussion is beneficial for data analysts, researchers using OriginLab for curve fitting, and anyone interested in accurately calculating areas under curves in their datasets.

mkay
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I have some data and in said data I had 2 peaks, to which I fitted 2 Lorentz functions. The sum of these 2 functions gives me a 3rd function.

Now, I need to find the integrated area of the 3rd function. Originlab gives me the area of the 2 fits, but not of the 3rd function. Summing the area of the 2 fits should give me the area of the 3rd function. However, I'm not sure it does because the 2 fits go below negative (so, an integration would be summing negative numbers to positive numbers). So the question is:

- Can I sum the 2 areas in order to get the cummulative area? Does Originlab 9 give me the mathematical area or the absolute area? I didn't find anything about this whatsoever.

Thanks in advance!
 
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Could you post some more info? Difficult to advise with the given description!
 

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