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Table 1 List of factors and corresponding variables

From: Understanding China’s urban system evolution from web search index data

Factors Indicators Variables
Economics development GDP in RMB yuan [2] GDP
Recreation and shopping services Proportion of tertiary sector [2] P-Third
Health care Total amount of beds in hospitals [2] Hos
Educational services Number of university students [44] Unv
Employment Working-age population [45] Workpop
Average salary [44] Sal
Administrative services Political city list PC, PT
Tourism Tourism city list [46] TC, PT
Business development Number of industrial enterprises [2] Bus