Instrumental variable methods are a third analytic approach that estimate the effect of an intervention in observational data without requiring the factors that differ between the intervention groups ...

The goal of comparative effectiveness research is to inform clinical decisions between alternate treatment strategies using data that reflect real patient populations and real-world clinical scenarios ...

Jerry Ferkingstad's May 17 Local View column, "Research methods at Ely bear center yield skewed results," was a refreshingly honest look at Lynn Rogers' observational bear research. Validated research ...