How to estimate the accuracy for an estimated tine segment when actual line is known?

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Tharindu Weerakoon
Tharindu Weerakoon el 25 de Nov. de 2015
Respondida: Image Analyst el 25 de Nov. de 2015
Suppose I have a set of XY coordinates (pink dots including noise)which is a measured values of a line segment (Black line). After estimating the best line (Orange line) for the measured data points, how can I calculate the accuracy of the fitted line with the actual one.
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Walter Roberson
Walter Roberson el 25 de Nov. de 2015
Editada: Walter Roberson el 25 de Nov. de 2015
How are you doing the estimation? In particular are you using polyfit()
Tharindu Weerakoon
Tharindu Weerakoon el 25 de Nov. de 2015
Estimating using Orthogonal Least squares method which is a separately written matlab m-file, not the ployfit() function.

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Image Analyst
Image Analyst el 25 de Nov. de 2015
You can get the residuals and use R or R^2 or the sum of absolute differences. R squared is a pretty common metric - why not use that?

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