I have some data to fit that looks like the blue curve, would anyone know what is it called or just the equation for it?
Some extra info: I`m trying to fit some data from an electronics experiment dealing with impedance (in alternating current, frequency dependent) and phase difference of inductors and capacitors.
Much Thanks
Too long for a comment.
The curve fit you want depends on what you want to do with it.
Without some underlying physical model, there is probably no nice looking expression that matches these data.
Your data covers a very large range of frequencies. That suggests that you don't plan to extrapolate to larger or smaller inputs. If what you want are interpolated values, there are several good possibilities. The data points are pretty dense, so linear interpolation might do. If you really need smoothness, consider splines.