Finding equilibrium (f(x) = 0

Hello,

I have plotted the change in data with time. Initially the curve increases by f(x) = 2 and later curves so it becomes 0. I would like to find a point on this straight line at which any small variations become insignificant so similar cases may be treated the same. I have the curve fitting toolbox.

Can someone suggest the method I should use to accomplish this, please? Gavin.

[Walter Roberson]

The point on what straight line? You said you were working with curves.

You are going to need to define "insignificant" for your purpose.

[Gavin Seddon]

I am working on a method which should define a point at which changes are expected which may be used as a cutoff point. Thanks.