What statistical methodology is used to create a trendline in numbers

I am doing a paper and have a trendline generated by Numbers on a scatter plot, and would like to avoid confirming my 'm' and 'b' values with a least squares calculation. Does anybody know what methodology is used in the algorithm that calculates trendlines in numbers so I can report that rather than doing the calculation myself?

Hi Michael,
It's really surprising what one can learn by reading the documentation supplied by Apple.
A search of the iWork Formulas and Functions User Guide using 'least squares' as the search term brings up two hits, both describing the LINEST function.
The same search in the Numbers '09 User Guide returns no results, but a search on 'trendline' returns many, with most occuring on two consecutive pages. Clicking one of these brings up the article Showing Trendlines in Charts, which doesn't directly mention "least squares", but does imply that method in the following note (emphasis added):
To see the R-squared value that was used to calculate a trendline, select the line, and then select Show R^2 Value. You can drag this number to wherever you want it to appear on the sheet.
Both these invaluable user guides are available for download via the Help menu in Numbers '09.
Regards,
Barry

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What statistical methodology is used to create a trendline in numbers

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