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