You can use Solver to fit such data. Send me private email if interested;
attach file with data and tell me the equation to use.
best wishes
--
Bernard Liengme
www.stfx.ca/people/bliengme
remove CAPS in email address


"Dan Burgess" <Dan wrote in message
...
I am using excel to curve fit to data in an X-Y Scatter plot. Does anyone
know of add-ins/extensions that allow plotting of trendlines for other
types
of curves eg. Sigmoid or sinusoidal curves?