"This paper examines the technical efficiency of U.S. Federal reserve check processing offices over 1980-2003. We use new unconditional quantile estimator of efficiency that avoids some drawbacks of other recently proposed estimators. The new estimator is fully non-parametric, robust with...

This paper describes a non-parametric, unconditional, hyperbolic quantile estimator that unlike traditional non-parametric frontier estimators is both robust to data outliers and has a root-n convergence rate. We use this estimator to examine changes in the efficiency and productivity of U.S....