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Robust orthogonal or total least squares linear regression

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Martina Boehme
Martina Boehme 2012-2-7
I am searching for a robust alternative for an orthogonal linear regression (or total least squares regression). I want to fit a line to 2D data, plot it in a x-y-graph together with the original data and calculate the slope of the fitted line, to use it for further calculations. I managed to use either a standart robust linear regression (robistfit) or a standart orthogonal regression (OrthLLS2D or wols), but not a combination of both. I also tried to use PCA (princomp), but there I do not manage to plot a line nor calculate the slope.
Thanks for any help! Martina

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Richard Willey
Richard Willey 2012-2-7
Unfortunately, Statistics Toolbox doesn't currently offer a robust version of PCA.
Your best option would probably be to use Optimization Toolbox and code up a custom objective function using an L1 norm.

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