I need to graph the error between a set of observed values and an expected values.
I calculate the relative error for each point as:
(observed - expect) / expected
This error however bounces up and down because the behaviour is sinusoidal. I want to make this error always a positive quantity. Is there an error measure like this? if so, what's its name?
I have looked for error measures, but all I find is absolute and relative, and I am interested in a positive relative error.
Any help appreciated, Ted.