Summary statistics for drimpair dataset :

by Jean Roth , jroth@nber.org , 22 Oct 2016

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |     46,127     28.0207    16.23866          1         56
     st_case |     46,127    280846.3    162366.3      10001     560113
      veh_no |     46,127    1.427667    .8776124          1         31
    drimpair |     46,127    20.81742    38.76261          0         99

by Jean Roth , jroth@nber.org , 22 Oct 2016