The charter school sector has expanded beyond brick-and-mortar schools to cyber schools, where enrollment grew almost tenfold between 2015 and 2020. While a large literature documents the effects of charter schools on test scores, fewer studies explore impacts on attainment or postsecondary outcomes and there is almost no work exploring the consequences of cyber charter enrollment for these outcomes. In this paper, I examine the impacts of Pennsylvania's charter high schools on student attendance, achievement, graduation, and postsecondary enrollment, distinguishing the impacts of brick-and-mortar from cyber schools. I find that brick-and-mortar charters have no or positive effects across outcomes, and that effects are concentrated in urban districts and among Black and economically disadvantaged students. By contrast, attending a cyber charter is associated with almost universally worse outcomes, with little evidence of heterogeneity. Students who enroll in a cyber charter at the beginning of ninth grade are 9.5 percentage points (pp) less likely to graduate, 16.8 pp less likely to enroll in college, and 15.2 pp less likely to persist in a postsecondary institution beyond one semester. These results suggest that additional regulation and oversight of cyber charter schools is warranted and also bring into question the efficacy of online education.

A particularly controversial topic in current education policy is the expansion of the charter school sector. This paper analyzes the spillover effects of charter schools on traditional public school (TPS) students in New York City. I exploit variation in both the timing of charter school entry and distance to the nearest charter school to obtain credibly causal estimates of the impacts of charter schools on TPS student performance, and I am among the first to estimate the impacts of charter school co-location. I further add to the literature by exploring potential mechanisms for these findings with school-level data on per pupil expenditures (PPE), and parent and teacher perceptions of schools. Briefly, I find charter schools significantly increase TPS student performance in both English Language Arts and math, and decrease the probability of grade retention. Effects increase with charter school proximity and are largest in TPSs co-located with charter schools. Potential explanations for improved performance include increased PPE, academic expectations, student engagement, and a more respectful and safe school environment after charter entry. The findings suggest that more charter schools in New York City may be beneficial at the margin, and co-location may be mutually beneficial for charter and traditional public schools.

Policy makers and analysts often view the reduction of student mobility across schools as a way to improve academic performance. Prior work indicates that children do worse in the year of a school move, but has been largely unsuccessful in isolating the causal effects of mobility. We use longitudinal data on students in New York City public elementary and middle schools to isolate the causal effects of school moves on student performance. We account for observed and time-invariant differences between movers and non-movers using rich data on student sociodemographic and education program characteristics and student fixed effects. To address the potential endogeneity of school moves arising from unobserved, time-varying factors, we use three sets of plausibly exogenous instruments for mobility: first-grade school grade span, grade span of zoned middle school, and building sale. We find that in the medium term, students making structural moves perform significantly worse in both English language arts (ELA) and math, whereas those making nonstructural moves experience a significant increase in ELA performance. In the short term, there is an additional negative effect for structural moves in ELA. These effects are meaningful in magnitude and results are robust to a variety of alternative specifications, instruments, and samples.