University of Pittsburgh's National Sports Brain Bank on June 26, 2023 causality control group CTE experimental group football longitudinal research populations sample +
I've tracked all my son's first words since birth [OC] on March 13, 2017 developmental psychology graphs and charts language development longitudinal research reddit within subject design +
Pew Research's "Growing Ideological Consistency" on October 10, 2016 interactive longitudinal research median normal distributions Pew-pew! politics skew +
Kennedy's "'Everybody Stretches' Without Gravity: Mark Kelly Talks About NASA's Twins Study" on March 14, 2016 biology genetics longitudinal research NASA twin +
Emily Oster's "Don't take your vitamins" on January 12, 2015 causality covariate fivethirtyeight health longitudinal research meta-analysis observational research preventative medicine replication research methods vitamins +