I am looking for good software for curve fitting. My curve equation is non-linear. I used Lab Fit and Excel software but could not find the curve equation with good accuracy. What software do you suggest for finding the curve equation?
If you are looking for something in the context of data analysis, the statistical software R can help you. An example, with an additive model, can be seen here: https://davetang.org/muse/2013/05/09/on-curve-fitting/
Fabrizio Frezza and Muhib Ullah Origin software is an excellent software because the software can find different equations with different accuracy for the curve without specifying the type of equation. Thank you for your guidance.
XLfit is a Microsoft Excel add-in for Windows that brings the power of scientific mathematics and statistics to Excel, together with supporting charting capabilities. XLfit is the leading statistical and curve fitting package for Excel and is used by the world’s leading pharmaceutical, chemical, engineering industries, research institutions and validated by the National Physical Laboratory (NPL).