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Appropriate test to use for measurement data

I have developed a machine-vision program that calculates the diameter of trees from Google Streetview images and GPS data. In order to verify the accuracy of my results, I went out and physically measured the diameter of 18 trees and ran my program against the same trees.

Now, I’m looking to analyze these data. One idea that I had was to calculate the differences between the expected (from my measurements) and the experimental (from my program) diameters and use that difference to calculate the percentile accuracy for each sample point. From that, I calculated the mean and median accuracies.

I would appreciate any suggestions for further analysis that might be done on my data in order to test its accuracy!


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