This paper analyzes Branch Rickey's 1954 equation in a regression context. The results for 1934--1953 are consistent with Rickey's conclusions, and the equation holds up well when extended 51 years. Two of Rickey's main points were that on base percentage dominates batting average and that...

This paper reviews recent developments in methods for dealing with weak instruments (IVs) in IV regression models. The focus is more on tests (and confidence intervals derived from tests) than estimators.The paper also presents new testing results under quot;many weak IV asymptotics,quot; which...