Matching (statistics): Statistics, Case control studies, Confounding variable, Rubin Causal Model, Paired difference test, Statistical bias, Multiple birth

Projection Pursuit Regression: Statistics, Statistical Model, Explanatory Variable, Gauss-Newton

Data Snooping Bias: Statistics, Statistical Bias, Mining, Significance, Testing Hypotheses Suggested by the

Latent Variable: Observable variable, variable (mathematics), Mathematical model, Statistics, Machine learning, Natural language processing