Baidu Migration Big Data

Baidu Migration Big Data provides indices of migration scale (including an in-migration scale index and an out-migration scale index) recorded in days for 369 cities(4 municipalities directly under the central government, 2 special administrative regions, 293 prefecture-level cities, 7 prefectures, 30 autonomous prefectures, 3 leagues, 29 county-level administrative units directly managed by the province, and Taiwan Province) in China and the percentage of in-migration from a particular city to the total in-migration from that city for each city's in-migration sources. The migration scale index reflects the size of a city's in-migration or out-migration populations and allows for cross-city comparisons. PM_ij is the index of spatial connection of population migration between city i and city j.

百度迁移大数据（Baidu Migration Big Data）为中国369座城市提供了逐日统计的迁移规模指数，涵盖迁入规模指数与迁出规模指数。上述369座城市包含4个直辖市（municipalities directly under the central government）、2个特别行政区（special administrative regions）、293个地级市（prefecture-level cities）、7个地区（prefectures）、30个自治州（autonomous prefectures）、3个盟（leagues）、29个省辖县级行政单位（county-level administrative units directly managed by the province）以及台湾省。同时，该数据集还提供了各城市的迁入来源构成数据：即从特定城市迁入的人口占该城市总迁入人口的比例。迁移规模指数可反映一座城市的迁入或迁出人口体量，且支持跨城市横向比较。PM_ij代表城市i与城市j之间的人口迁移空间联系指数。