Intergovernmental relations play an important role in policy innovation diffusion, yet few studies have analyzed its impact on open government data (OGD) adoption. We used event history analysis to analyze the diffusion of OGD in China. The diffusion of OGD among municipal governments is primarily influenced by vertical pressure from superior governments and horizontal pressure from neighboring governments, with the latter having a greater impact. The provincial government plays an intermediary role between the central government and the municipal government. A comprehensive analysis of the interplay between policy signals and policy pilots demonstrates that provincial signals have a substantial influence on municipal pilots, whereas the impact of provincial pilots on municipal signals is insignificant. These findings contribute to OGD adoption research and practices and promote the development of policy diffusion theory.

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