I need to find the trend of the curves in the attached graph. What is the best way to define the trend? I am not looking for the polynomial equation. I want to define them like 'the trend is a hyperbolic or parabolic curve and we can represent the curve by a equation with some coefficients'. Any help will be appreciated.
- so far, I am thinking of a hyperbolic equation (y-a=1/x-b)
