The Living Thing / Notebooks :

Coarse graining

AFAICT, this is the question ‘how much worse do your predictions get as you discard information in some orderly fashion?’, as framed by physicists.

Do “renormalisation groups”, whatever they are, fit in here? How about Scholtes and his time-respecting networks?

Where the coarse gaining is itself a stochastic proces, is this just a hierarchical model, in the statistical sense?

To consider: the algorithmic statistics angle, the pseudorandomness angle, the topological angle as exemplified by the suggestive utility of sigma-algebras and filtrations here.

To read, canon

To read, actually want to