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| Variables |
| Air transportation | Passenger traffic (10 000 persons): x1 Freight traffic (10 000 tons): x2 |
| Local economy | Gross domestic product of Tianjin (100 million yuan): y1 Total value of imports & exports in foreign trade (USD 100 million): y2 Total government revenue (100 million yuan): y3 Number of employment personnel (10,000 persons): y4 Foreign exchange earning from international tourists (USD 10,000): y5 Gross product of transportation storage and post services(100 million yuan):y6 Gross product of wholesale and retail trade (100 million yuan): y7 Per capita annual disposable income of urban households (yuan): y8 Foreign capital actually used (USD 10 000): y9 |