Fig. 1
From: The efficiency of routine infant immunization services in six countries: a comparison of methods
Efficient frontiers estimated by DEA and SFA. Panel a efficient frontier estimated by DEA under variable returns-to-scale for each country. Dashed line represents the conventional deterministic DEA frontier. Solid line represents the Simar and Wilson bias-corrected DEA frontier. Panel b efficient frontier estimated by SFA for each country. Dashed and solid lines represent the mean function and efficient frontier respectively, for the semi-parametric SFA estimator proposed by Fan et al. For Uganda and Zambia no frontier could be calculated, due to inability to decompose error and efficiency terms