Publicly Funded R&D Collaborations and Patent Outcome in Germany

The central role of the propensity score in observational studies for causal effects

Paul R. Rosenbaum, Donald B. Rubin · Biometrika · 1983 · 31K citations · Full text

Public Health, Biostatistics, Causal Inference +16

Sample Selection Bias as a Specification Error

James J. Heckman · Econometrica · 1979 · 28.9K citations

Social Sciences, Economics, Behavioral Economics +16

Matching As An Econometric Evaluation Estimator: Evidence from Evaluating a Job Training Programme

James J. Heckman, Hidehiko Ichimura, Petra Todd · The Review of Economic Studies · 1997 · 5.5K citations

Social Sciences, Economics, Econometrics +15

The Central Role of the Propensity Score in Observational Studies for Causal Effects

Paul R. Rosenbaum, Donald B. Rubin · Biometrika · 1983 · 3.5K citations

Public Health, Biostatistics, Causal Inference +16

Networks of innovators: A synthesis of research issues

Christopher Freeman · Research Policy · 1991 · 1.8K citations

Management, Innovation Management, Innovation +11