„16% of the variation in mathematics performance across OECD countries can be explained by differences in the proportions of students who skip school.“
OECD (Hrsg.), „PISA in Focus“, Nr. 35, Jänner 2014, S. 2
„16% of the variation in mathematics performance across OECD countries can be explained by differences in the proportions of students who skip school.“
OECD (Hrsg.), „PISA in Focus“, Nr. 35, Jänner 2014, S. 2