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# Statistics/Machine Learning Dictionary

Statistics Machine Learning Meaning
estimation learning using data to estimate an unknown quantity
classification supervised learning predicting a discrete $$Y$$ from $$X$$
clustering unsupervised learning putting data into groups
data training sample $$(X_1, Y_1),...,(X_n, Y_n)$$
covariates features the $$X_i$$'s
classifier hypothesis a map from covariates to outcomes
hypothesis - subset of a parameter space $$\Theta$$
confidence interval - interval that contains an unknown quantity with given frequency
directed acyclic graph Bayes net multivariate distribution with given conditional independence relations
Bayesian inference Bayesian inference statistical methods for using data to update beliefs
frequentist inference - statistical methods with guaranteed frequency behavior
large deviation bounds PAC learning uniform bounds on probability of errors