Table 1.

Effect of yellow on the accident rate using Aim=α+βYellowim+εim

VariablesParameter estimatesRobust standard error
  • The dependent variable Aim{0,1} is whether driver i had an accident in month m, the key independent variable Yellowim is whether driver i’s taxi was yellow in month m, α is the constant, and εim represents the random error term. The number of observations is based on all registered taxis in the company (ranging from 15,588 to 16,933 per month) in the 36-mo period. R2 is the coefficient of determination. ***P < 0.0001.