Research Article
Exploring Built Environment Influence on Taxi Vacant Time in Megacities: A Case Study of Chongqing, China
Figure 6
Estimated degrees of freedom with smooth spline functions on taxi vacant time for explanatory variables. (a) Number of catering services. (b) Number of motor vehicle services. (c) Number of residence communities. (d) Number of bus stops. (e)Road density (km/km2). (f) Average traffic flow speed (km/h). Note: the horizontal coordinate indicates the actual value of each explanatory variable, the vertical axis indicates the value of the smooth function, the shading indicates the upper and lower limits of the confidence interval, and the solid line indicates the smooth fitted curve of each explanatory variable.
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