Hello I have some charts which I am trying to fit lines of best fits to.
The general shape of these curves is something representing '4 o' clock' on
a clock.
I am trying to do non-linear regression to get the closest fit to these
curves but the trendline functions on excel are very limited (ie
logarthmic,exponential,polynomial etc) and do not produce a sufficient
trendline.
I was wondering if anyone knows how I could possibly produce the trendline
that I require that fits the data on the curve.
Many thanks for your help.
Warm regards