Research Article
Exploring Built Environment Influence on Taxi Vacant Time in Megacities: A Case Study of Chongqing, China
Table 2
Estimation results of GAM model.
| Explanatory variables | Coefficients | Estimate | Std. Error | t value | Pr (>|t|) |
| Intercept | 2.0860 | 0.0083 | 251.450 | <2e − 16 | ENT | −0.0027 | 0.0002 | −10.943 | <2e − 16 | FAI | 0.0027 | 0.0007 | 3.751 | 0.0002 | GOV | −0.0013 | 0.0003 | −4.339 | 1.43e − 05 | HTS | 0.0043 | 0.0004 | 10.734 | <2e − 16 | LFS | 0.0018 | 0.0003 | 6.787 | 1.14e − 11 | HCS | 0.0034 | 0.0004 | 8.486 | <2e − 16 | MLB | −0.0012 | 0.0012 | −0.955 | 0.3395 | SAE | 0.0001 | 0.0003 | 0.400 | 0.6893 | SHP | −0.0002 | 0.0001 | −3.761 | 0.0002 | SLE | 0.0099 | 0.0005 | 20.643 | <2e − 16 | SNS | −0.0007 | 0.0007 | −1.019 | 0.3081 | PMT | −0.0365 | 0.0081 | −4.487 | 7.23e − 06 | MET | 0.3239 | 0.0075 | 42.915 | <2e − 16 |
| Explanatory variables | Approximate significance of smoothing terms | EDF | Ref. Df | F | value |
| s (TFS) | 8.929 | 8.999 | 5393.5 | <2e − 16 | s (DSR) | 8.927 | 8.998 | 1711.3 | <2e − 16 | s (BSN) | 8.774 | 8.978 | 391.6 | <2e − 16 | s (CAT) | 8.943 | 8.999 | 421.6 | <2e − 16 | s (MVS) | 8.949 | 8.999 | 687.1 | <2e − 16 | s (RES) | 8.591 | 8.931 | 405.5 | <2e − 16 | s (longitude, latitude) | 28.945 | 29.000 | 1835.5 | <2e − 16 | t2 (DOW, TSLOT) | 21.966 | 23.236 | 117.9 | <2e − 16 | Model fit | R-sq.(adj) | 0.759 | | |
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Significance codes: “ ” 0.001. s ( ): smooth spline function. t2 ( ): smooth tensor product. |