|
| Variable | Definition | Index | Data Description |
| Explained variable | w | Skill-based wage gap |
| China Labor Statistics Yearbook China Provincial Statistical Yearbook World Input-Output Database (WIOD) China Urban Household Survey Data (UHS) |
| Core explanatory variables | R | Number of industrial robots | Import volume of industrial robots | China Commodity Trade Database with data support from China Customs, National Bureau of Statistics, China Provincial Statistical Yearbook |
| Moderator | SLS | Labor supply skill-based structure | The proportion of the population with a college degree or above in the population aged 16 and above | China Labor Statistics Yearbook China Population and Employment Statistical Yearbook |
| Control variable | exp | Export | The ratio of exports to GDP | China Provincial Statistical Yearbook |
| fdi | Foreign direct investment | The ratio of total foreign investment to GDP | China Provincial Statistical Yearbook | |
| pgdp | GDP per capita | GDP to total population ratio | China Provincial Statistical Yearbook | |
| lnst | Industrial structure | The ratio of the output value of the tertiary industry to the output value of the secondary industry | China Provincial Statistical Yearbook | |
| old | Population structure (aging situation) | The proportion of the population aged 65 and over in the working population aged 15 to 64 | China Provincial Statistical Yearbook | |
| mon | Proportion of state-owned economy | The ratio of gross output value of SOEs above designated size to GDP | China Provincial Statistical Yearbook | |
| gdk | Fixed asset investment | Ratio of fixed asset investment to GDP | China Provincial Statistical Yearbook |