Janský, Petr; Li, Natalia - 2021
that, in its 2019 version, draws on 13 different data sources for calculation, with a threshold of at least three available … sources for a country to qualify for a ranking. Until now, however, it has not been clear whether the data sources it uses are … the only suitable ones. To assess this, we revisit the choice of these data sources and propose several improvements to …