Fig. 2
From: The efficiency of routine infant immunization services in six countries: a comparison of methods
Distribution of technical efficiency scores estimated by DEA and SFA. Efficiency scores represent Shepherd input efficiency. DEA efficiency estimated by Simar and Wilson bias-corrected method under variable returns-to-scale. SFA efficiency estimated using semi-parametric SFA estimator proposed by Fan et al. Distributions and means adjusted for survey weighting. For Uganda and Zambia no frontier could be calculated, due to inability to decompose error and efficiency terms