Förbättrar friskolor elevers prestationer?

Det finns få som idag ifrågasätter friskolesystemet i Sverige. Det kan man hälsa med tillfredsställelse, om man bryr sig om goda testresultat. En ny studie, ”‘Every Catholic in a Catholic School’: Historical Resistance to State Schooling, Contemporary School Competition, and Student Achievement Across Countries”, publicerad i Economic Journal, finner nämligen att friskolor är gynnsamma för elevers prestationer. Forskarna beskriver sina resultat:

Our results indicate that the share of schools that are privately operated has an economically and statistically significant positive effect on student achievement in mathematics, science, and reading … Importantly, much of the positive effect of private school shares accrues to students in public schools, suggesting that the overall effect is not simply due to privately operated schools being more effective, but rather it reflects benefits of competition. … Interestingly, descriptive evidence also suggests that a larger share of privately operated schools is also associated with a strong reduction in the dependence of student achievement on socioeconomic status – as long as all schools are publicly financed (Woessmann et al. 2009). In other words, the additional choice created by public funding for privately operated schools seems to particularly benefit disadvantaged students and thus boost equity in the school system.

En illustration av sambandet:

Dessa resultat är helt i linje med en tidigare studie av effekten av friskolor just i Sverige. Den som motsätter sig friskolor får gärna klargöra på vilken grund, givet vad forskningen verkar visa om deras effekter.