Fig. 3
From: The efficiency of routine infant immunization services in six countries: a comparison of methods
Comparison of site efficiency ranking by DEA and SFA. 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. Higher rank (upper right) indicated higher efficiency score. Results for Uganda and Zambia not shown as SFA efficiency could not be estimated for these countries