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Old 09-17-2012, 04:05 AM
mareram mareram is offline
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Join Date: Jul 2012
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Default Regression on hidden variables

I'm thinking about...

Imagine that I've got a set of variables x_i I want to make regression on. But I can only observe other different set of variables y_j = f_j(x_i). With f_j not known and the x_i being hidden variables.

I guess that I can make assumptions (which can be tested using validation later with different sets of f_j) about the form of the functions f and then derive certain nonlinear transformations that correspond to those f and which relate the x's and the y's.

Then I can make nonlinear regression to the x's. But it seems a bit twisted since I'm applying nonlinear transformations twice.

does anyone know about a particular theory on machine learning that copes with this kind of problems? Or simply what I should do is considering a set of nonlinear transformations big enough so that it contains the transformations needed for adjusting to x_i and to transform them later to the y_j?

Thanks a lot
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Old 01-21-2013, 11:21 AM
palmipede palmipede is offline
Join Date: Jan 2013
Posts: 13
Default Re: Regression on hidden variables

Life is much easier if the f's are known and linear. If they are not known but linear that is an estimation problem. I'd start looking for Gaussian state-space models or linear dynamical systems.
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hidden variables, nonlinear transformations, regression, unknown variables

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