Hidden variables and latent factors

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This isn’t a thing per se.
But I want a landing page for a few differnt ways to think about hidden variables.

If the hidden varaibles are random, I might think of hierarchical models, latent factors, deep networks, informative sampling, censored data…

If the hidden variables are determninistic I might think of algorithmic complexity.

Random thing:
Matrix factorisation to approximate latent factors and their interaction in recommender systems.

KoBV09
Koren, Y., Bell, R., & Volinsky, C. (2009) Matrix Factorization Techniques for Recommender Systems. Computer, 42(8), 30–37. DOI.

See original: The Living Thing / Notebooks Hidden variables and latent factors