Table 1 Division grade corresponding to each social variable.
From: Predicting the potential risk area of illegal vaccine trade in China
Socioeconomic variable | Grade quantity | Intervals |
|---|---|---|
National urban population density (population-density) | 5 | Person/sq.km. |
Medical institutions at and under the township level throughout the country (medical-institutions) | 4 | Less than 100, 100–200, 200–300, and more than 300 |
Average monthly wages (monthly-wage) | 4 | Less than RMB 3,500, RMB 3,500–4,000, RMB 4,000–4,500 and more than RMB 4,500 |
Industrial structure | 3 | Percentage of employees in primary, secondary and tertiary industries |
City data (cities) | 2 | provincial capital and non- provincial capital |
Freight-volume | 5 | 10,000 tons |
Primary-industry-working-population | 5 | 10,000 persons |
