The role of sample characteristics in the stability of value-added estimates of school effects: sample size, student mobility and sample heterogeneity. KU Leuven
Many countries use value added (VA)-estimates as indicators of the effectiveness of their schools. A major issue is the instability of schools' VA-estimates over successive years. Instable VA-estimates may indicate a lack of reliability and are therefore less usable for intended purposes, e.g., identification of (in)effective schools or school choice. A challenge is to provide evidence of the characteristics that drive the artificial ...