Summary statistics for drimpair dataset :

by Jean Roth , jroth@nber.org , 18 Apr 2016

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |     44,149    27.94174    16.26131          1         56
     st_case |     44,149    280015.6    162578.1      10001     560121
      veh_no |     44,149    1.408073    .7751428          1         26
    drimpair |     44,149     21.1251     38.9823          0         99

by Jean Roth , jroth@nber.org , 18 Apr 2016