En el volumen 8, número 3, de la Revista Education Next de la Hoover Institution, que acab de aparecer, los colegas Gregory Elacqua, Dante Contreras y Felipe Salazar publican el artículo Scaling Up in Chile, el cual da cuenta de una investigación sobre el efecto que tiene en el rendimiento de los alumnos el hecho de que las escuelas privadas subvencionadas pertenezcan a una red de establecimientos (network schools) en comparación con escuelas que actúan como una unidad singular (stad-alone schools).

Los autores llegan a la siguiente conclusión:

Without accounting for any differences in students’ socioeconomic status, the Spanish language and mathematics test scores of students who attend network schools are considerably higher than the scores of those attending stand-alone schools. After controlling for student and peer attributes and for selection bias, we still find a substantial positive and statistically significant effect of attending a network school on student achievement. Students at network schools score 19 percent and 25 percent of a standard deviation higher than students at stand-alone schools in Spanish language and math, respectively. We also find that students at municipal schools do significantly worse than students at stand-alone schools on achievement tests (19 percent and 16 percent of a standard deviation in Spanish language and math, respectively), although, as discussed above, we are less confident in these results because of the difficulties of accounting for the selection of students into and by private schools.

A la hora de las explicaciones, los autores plantean, en resumen:

Possible explanations for the positive school network effect include the substantial benefits of scale for employing education professionals and administrators, the bulk purchases of supplies and equipment, and the costs of implementing innovations in the curriculum. School networks may also benefit from greater access to credit and private investment than that extended to small individual schools in Chile. In addition, it may be that operating within a larger communal organization reduces agency problems; encourages interactions between parents, teachers, administrators, and students; and influences the development of professional school communities.

Of course, it is also possible that good schools are invited to join networks, while weaker schools are left on their own. In a competitive schooling environment, low-quality schools may be unable to attract students and additional resources needed to expand operations.

Gregory Elacqua is professor at the Universidad Diego Portales in Santiago, Chile, and former policy advisor to the Minister of Education of Chile. Dante Contreras is senior researcher at the United Nations Development Program (UNDP) Chile and associate professor, Universidad de Chile. Felipe Salazar is researcher at the Universidad Diego Portales.