Can we create a trend line with a custom equation, for example y = a*x^b + c?
(3 arguments to be estimated: a, b and c, which are real numbers).
Thank you.
Thanks, but that doesn’t seem to be what I’m looking for. The custom equation I mentioned above is a power function (with 2 terms) and not a polynomial one (the CorelPolyGUI extension is for polynomial function only, isn’t it?).
Hi @Nesbit, if you insist having b as a real number you are right. Polynomial function have b as integer. Other option: insert an extra Y-column in your xy-chart with your equation.
Hi @horst. Sorry for the late reply.
I think you misunderstood my question. In the equation, the three coefficients a, b and c are the arguments to be estimated (i.e. a, b and c are unknown) so that the trend line fit the data.
For example, for a set of data A, we find a = 0.5, b = 0.2, c = 1.2. For another set of data B, we find a = 0.7, b = 0.5, c = 1.5.
Hope that’s clear enough.
Have a nice day !