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MS Office Forum / Excel / Charting / October 2007excel's curve-smoothing algorithm
I have some raw data in excel, with a smooth curve added. I am trying to reproduce this curve on the same data in GraphPad Prism, with poor results. Does anyone know how excel calculates curve smoothing? As far as I can recall Microsoft uses a cubic spline but I have not seen the exact formula. Try Google with search term: excel spline best wishes  SignatureBernard V Liengme Microsoft Excel MVP www.stfx.ca/people/bliengme remove caps from email >I have some raw data in excel, with a smooth curve added. I am trying > to reproduce this curve on the same data in GraphPad Prism, with poor > results. Does anyone know how excel calculates curve smoothing? Brian Murphy has determined that the smoothing algorithm is a Bezier curve. Find the link to this workbook (Smooth_curve_bezier_example_file.xls) in the bottom part of this page: http://www.xlrotor.com/resources/files.shtml - Jon ------- Jon Peltier, Microsoft Excel MVP Tutorials and Custom Solutions Peltier Technical Services, Inc. - http://PeltierTech.com _______ >I have some raw data in excel, with a smooth curve added. I am trying > to reproduce this curve on the same data in GraphPad Prism, with poor > results. Does anyone know how excel calculates curve smoothing? |
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