@misc{Skórska_Paulina_Estimating,
 author={Skórska, Paulina and Świst, Karolina and Szaleniec, Henryk},
 howpublished={online},
 publisher={Educational Research Institute},
 language={pol},
 type={article},
 title={Estimating the predictive validity of school grades with hierarchical linear modeling},
 keywords={predictive validity, hierarchical linear modelling, school grading, class selectivity, standardized test},
}