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. 2021 Feb 12;118(7):e2015826118. doi: 10.1073/pnas.2015826118

Fig. 3.

Fig. 3.

Difference between the mean of countries above the third quartile and the mean of countries below the first quartile in mean years of schooling (MYS) and skills in literacy adjusted mean years of schooling (SLAMYS), 1970–2015. Calculations are based on data from the PIAAC Survey of Adult Skills (30), the World Bank’s STEP Skills Measurement Program (31), the Demographic and Health Survey (32), the WIC Human Capital Data Explorer (20), the International Adult Literacy Survey (29), UIS statistics (33), and the global dataset on education quality (34). Countries are ranked based on their average SLAMYS between 1970 and 2015.