This research analyses the socioeconomic and cultural segregation of students across school catchment areas using census data for the students in their second year of secondary education in Andalusia (the most populated region in Spain). The main methodology used is the Mutual Information Index, which satisfies all the desirable properties for measuring segregation. Concretely, we draw upon the additive decomposability property, which decomposes the segregation of students across schools into the different levels in which schools can be grouped, that is, catchment areas and, within catchment areas, by source of funding (public and semiprivate schools). We found that school segregation is greater than catchment areas’ segregation. Additionally, statistically significant correlations are found between the level of segregation within the catchment areas and factors such as size of the catchment area, parental level of education and size of the municipality where the school is located.

本研究使用安达卢西亚（西班牙人口最多的地区）中等教育二年级学生的人口普查数据分析了学校学区内学生的社会经济和文化隔离。使用的主要方法是互信息指数，它满足测量隔离的所有理想属性。具体而言，我们利用可加分解性属性，它将跨学校学生的隔离分解为学校可以分组的不同级别，即学区和在学区内，按资金来源（公立和半私立学校） . 我们发现学校隔离大于集水区隔离。此外，