Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Since their inception, charter schools have been a lighting rod for controversy, with much of the debate revolving around their effectiveness in improving student achievement. Previous research has shown mixed results for student achievement; this could be the consequence of different policy environments or varying methodological approaches with differing assumptions across studies. In our analysis, we discuss these approaches and their assumptions and estimate charter school achievement effects using a consistent methodology across seven locations.