Table S5.

Effect of yellow on the accident rate by lighting condition

Street lightingDaylightNo light
VariablesParameter estimatesRobust standard errorParameter estimatesRobust standard errorParameter estimatesRobust standard error
Yellow–0.0045***(0.0005)–0.0020**(0.0006)0.0004***(0.0001)
Constant0.0278***(0.0002)0.0437***(0.0003)0.0002***(0.0000)
Observations592,296592,296592,296
R20.00010.00000.0001
  • The dependent variable Aim{0,1} is whether a driver had an accident under certain lighting conditions in a given month, and the key independent variable is whether the taxi was yellow. The number of observations is based on all registered taxis (ranging from 15,588 to 16,933 per month) in the 36-mo period. R2 is the coefficient of determination. ***P < 0.0001, **P < 0.001.