Well, thanks for the advice, but I think since my curve is not linear or
something, it doesn't give me the Add trendline option. My curve looks like a
3rd order polynomial.

"MartinW" wrote:

Hi Naty

Right click on one of your data points and select Add trendline.
The trendline dialog boxes offers a number of options for
type of trendline, showing equations in chart etc.

HTH
Martin