This article develops a measure of efficiency to use with aggregated data. Unlike the most commonly used efficiency measures, our estimator adjusts for the heteroskedasticity created by aggregation. Our estimator is compared to estimators currently used to measure school efficiency. Theoretical...

In this paper we investigate the relationship between the agricultural technological level and R&D expenditures, human capital and openness to international trade using cross country information for a sample of 104 countries and various sub samples over the period 1961-1991. We first model the...