See Excel Tips for how to use LINEST for polynomial fit
See TUSHA at www.tushar-mehta.com/excel/ tips/trendline_coefficients.htm
for other curves
Not sure what you mean by 3D in this context

Do you know about Trendlines in XY charts?

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Bernard V Liengme
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"Vidya Raja" <Vidya wrote in message
...
I have a set of data points and wish to do a curve fit. How can I do this
in
Excel? The figure is 3D.

Thanks,
Vidya