@misc{Jasińska-Maciążek_Aleksandra_Significance,
 author={Jasińska-Maciążek, Aleksandra},
 howpublished={online},
 publisher={Educational Research Institute},
 language={pol},
 type={article},
 title={Significance of student age variance in estimating value added measures for Polish lower secondary schools},
 keywords={educational value added, EVA validity, birthday effect, age effects, early school entry, delayed school entry, grade retention, gains in school achievements},
}