Urban Agglomeration and Inter-city Innovation Collaboration

The initial sample consists of panel data at the city-pair level from 2010 to 2022 in China. The raw patent data is sourced from the China National Intellectual Property Administration's database. Urban agglomeration policy data is manually compiled by reviewing official documents, including urban agglomeration development plans from the State Council and National Development and Reform Commission. Nighttime light data is obtained from the NPP-VIIRS dataset. Control variables are primarily from the China City Statistical Yearbook, individual city statistical yearbooks, and the China Stock Market & Accounting Research (CSMAR) database. Only observations with no missing values for the main variables are retained, and the top and bottom 1% and 99% of all continuous variables are winsorized. After these treatments, the final sample includes 379,084 city-pair-year observations.

初始样本包含2010至2022年中国城市对层面的面板数据。原始专利数据来源于中国国家知识产权局（China National Intellectual Property Administration）数据库。城市群政策数据通过梳理官方文件手动汇编得到，涵盖国务院（State Council）与国家发展和改革委员会（National Development and Reform Commission）印发的城市群发展规划。夜间灯光数据取自NPP-VIIRS数据集。控制变量主要来源于《中国城市统计年鉴》、各城市统计年鉴以及中国股票市场与会计研究（CSMAR）数据库。本研究仅保留核心变量无缺失值的观测样本，并对所有连续变量实施上下1%分位的缩尾处理（winsorized）。经上述处理后，最终样本共包含379084个城市对-年度观测值。