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Probability

General introductions

Further

Stochastic processes (without measure theory)

Applied

With measure theory

Modern probability theory builds its mathematical foundation on measure theory, which is generally regarded as an intermediate-to-advanced topic in real analysis. Some of these books assume exposure to it, others aim to teach it as they go.

Statistics

Biostats

Machine Learning

AKA statistical learning, data mining, predictive modeling.

The free books

Other big books

Natural language processing

Information retrieval