Summary statistics for drimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |     46,009    27.93058    16.12662          1         56
     st_case |     46,009    279902.9    161233.7      10001     560139
      veh_no |     46,009    1.438023    .7678429          1         15
    drimpair |     46,009    17.06557    35.39884          0         99

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