Accident Analysis & Prevention · 2004 · 143 citations · 28 references
Public HealthHealth SciencesInjury PreventionInjury SurveillanceOccupational HealthOccupational Injury PreventionHelmet SafetyHelmet UseInjury EpidemiologyOccupational SafetyTraffic SafetyTransportation SafetyHelmet Use DeterminantsHelmet Wear BehaviorMotorcycle Helmet SafetyMotorcycle Helmet UseMotorcycle Safety
28
Sample Selection Bias as a Specification Error
James J. Heckman · Econometrica · 1979 · 28.9K citations
Estimating Regression Models with Multiplicative Heteroscedasticity
Andrew Harvey · Econometrica · 1976 · 957 citations