The effects were small for neighborhood impact (traditional schools improved +.02 SDs) and larger for co-locations (traditional schools improved +.06-.09 SDs).
What is the value of charter schools?
Charter schools could help students in two ways: (1) directly serving students and (2) increasing the performance of other schools.
I don’t believe that #2 must be true in order to support charter schools. The very fact that charter schools help the students they serve could be enough to warrant support.
An even more complicated question: what if charter schools increased the performance of the students they served but decreased the performance of traditional schools?
If, like me, you believed non-profit operation of schools should overtime supplant direct government operation of schools, then you still might support the expansion of charter schools. The negative impact of charter growth on traditional schools, while painful, could be a price worth paying if more children were benefitted by the new system over the long-haul.
Be careful how you justify your opinions
The reason I make this point is that I don’t think we should tie the value of charter schools to their impact on nearby traditional schools.
While this impact is something we should understand – and if in some instances there are negative impacts we should we work to reduce them – ultimately, the fact that their might be a better way to do public education should be our Northstar.
Building the new system is more important to children than protecting the old system.
But hopefully we continue to find more evidence of win / win
That being said, this study is good news: it’s pretty amazing that New York City has grown a high-quality charter sector and that this sector has helped improved traditional schools.
Hopefully future studies will show the same.
But they might not. And expanding great public charter schools might still be the best thing for children.
So we should be cautious in justifying the existence of charter schools in how they impact traditional schools.
Ultimately, their highest and best use is likely to be in the creation of a better way to do public schooling at scale.