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Shapiro's "New Study Links Widening Income Gap With Life Expectancy" on April 04, 2016 covariate health +1 multivariate regression news NPR regression third variable problem covariate health multivariate regression news NPR regression third variable problem
Oster's "Everybody Calm Down About Breastfeeding" on January 04, 2016 breast feeding covariate +2 developmental psychology fivethirtyeight social justice third variable problem breast feeding covariate developmental psychology fivethirtyeight social justice third variable problem
"Correlation is not causation", Parts 1 and 2 on July 20, 2015 correlation linear relationship +2 research design scatter plots third variable problem video correlation linear relationship research design scatter plots third variable problem video