| Variables | Symbol | Values | Corresponding parameter |
| Age | | 21–30, 31–40, 41–50, 51–60, and over 60 years old take values of 1, 2, 3, 4, and 5 separately | | Income | | Under 5000, 5000–10000, and 10000–15000 and over 15000 yuan take values of 1, 2, 3, and 4 separately | | Parking fee | | Raised by under 30%, 30%–50%, 50%–80%, and 80%–100% and over 100% take values of 1, 2, 3, 4, and 5 separately | | Walking distance | | Under 100, 100–300, 300–500, and 500–800 and over 800 meters take values of 1, 2, 3, 4, and 5 separately | | Parking duration | | Within 1 hour and 1-2, 2–4, 4–6, and over 6 hours take values of 1, 2, 3, 4, and 5 separately | |
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