Fig. 1From: No theory: an explanation of the lack of consistency in cross-country health care comparisons using non-parametric estimatorsCross-country efficiency ranking comparisons and Pearson correlation coefficients using hyperbolic order-α estimator, 2010. *NOTE: This figure compares cross-country efficiency rankings across a variety of paper specifications. Numbers in the upper triangle represent the Pearson correlation coefficient between any two sets of rankingsBack to article page