I show a graph where errors in perceived angles of stimuli increase with the underestimation of lengths of stimuli. I want to find an equation that will describe when maximum error should occur. Specific questions are below. Please see the attached graph. I will be happy with any suggestions that will help me figure this out.(adsbygoogle = window.adsbygoogle || []).push({});

GRAPH DESCRIPTION

It shows a difference between perceived and real angles between edges of certain stimuli (Y-axis) as a function of real angles of stimuli (X-axis).

Separate lines are for different % errors in the perceived lengths of these stimuli. Negative values (-10 to -80 %) stand for % underestimation of lengths.

As you can see difference between perceived and real angles increases with % error in estimation of lengths.

MY QUESTIONS:

Do you have any suggestions about how to generate an equation that will describe this graph? How can I show, using an equation, where the maximum error in perceived angles should occur? That is at what angle (x-axis) would I observe the largest difference between perceived and real angles (y-axis)? Also, how can I show what is the maximum difference between perceived and real angles for specific % errors in perceived lengths?

I hope I am in the right forum :)

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# What's the equation?

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