More than likely the trendline feature is dimmed due to the type of chart
you're using. You can add trendlines to data series in unstacked 2-D area,
bar, column, line, stock, xy scatter, and bubble charts. You cannot add
trendlines to data series in 3-D, stacked, radar, pie, surface, or doughnut
charts. Certain combinations of the above will probably not allow trendlines
either. If your chart type is included in one of the types that does not
accept trendlines, I would suggest changing it to one that does.

Alternatively, you could calculate the trendline in worksheet cells and then
plot those cells as a seperate series. The trendline formulas are available
via Excel's on-line help.

--
Regards,
John Mansfield
http://www.pdbook.com


"shappy96" wrote:

In Excel 2002, my Add Trendline command on the Chart menu is dimmed. Why?
Is it an add-in that I need? How can I enable it?
--
shappy96