Before revision:  A Poisson fixed-effects model is developed to evaluate the ridership elasticity to frequency  using passenger count data from Portland, Miami, Minneapolis/St-Paul, and Atlanta between 2012 and 2018.
After revision:  A Poisson fixed-effects model is developed to evaluate the ridership elasticity to frequency on weekdays using passenger count data from Portland, Miami, Minneapolis/St-Paul, and Atlanta between 2012 and 2018.