ging ▁stated ▁preference ▁and ▁revealed ▁preference ▁data ▁in ▁an ▁empir ical ▁study ▁to ▁evaluate ▁alternative ▁fuel ▁vehicle ▁market ▁pen etr ation ▁▁▁ 2 0 0 0 ▁– ▁Thomas ▁Gol ob ▁developed ▁a ▁model ▁that ▁joint ly ▁generates ▁activity ▁participation , ▁travel ▁time , ▁and ▁trip ▁generation ▁▁ 2 0 0 0 ▁- ▁Anthony ▁Chen ▁form ulated ▁the ▁traffic ▁equilibrium ▁problem ▁as ▁an ▁un const rained ▁optimization ▁problem ▁that ▁is ▁equivalent ▁to ▁the ▁non linear ▁complement ar ity ▁problem . ▁▁ 2 0 0 1 ▁– ▁Kenneth ▁Small ▁measured ▁values ▁of ▁time ▁and ▁reli ability ▁from ▁ 1 9 9 8 ▁data ▁where ▁commut ers ▁chose ▁between ▁a ▁free ▁and ▁a ▁vari ably ▁to l led ▁route ▁▁ 2 0 0 1 ▁– ▁Mar lon ▁Bo ar net ▁further ▁showed ▁that ▁the ▁influence ▁of ▁land ▁use ▁on ▁travel ▁behavior ▁is ▁high ▁sensitive ▁to ▁the ▁choice ▁of ▁behavior al ▁and ▁statistical ▁assumptions ▁▁ 2 0 0 1 ▁– ▁Thomas ▁Gol ob ▁and ▁Am elia ▁Reg an ▁expl ored ▁ways ▁of ▁applying ▁information ▁technology ▁to ▁personal ▁travel ▁and ▁fre ight ▁research ▁▁ 2 0 0 3 ▁– ▁Thomas ▁Gol ob ▁conducted ▁a ▁review ▁of ▁the ▁literature ▁on ▁struct ural ▁equation ▁mod elling ▁for ▁travel ▁behavior ▁research ▁▁ 2 0 0 4 ▁- ▁Kenneth ▁Small ▁argued ▁that ▁second - best ▁to ll ▁pr icing ▁requires ▁explicit ▁consideration ▁of ▁user ▁heter ogene ity . ▁▁▁ 2 0 0 5 ▁– ▁By ▁mer ging ▁R P ▁and ▁SP ▁data , ▁David ▁Brown stone ▁and ▁Kenneth ▁Small ▁showed ▁that ▁value