Summary statistics for drimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |     45,136    27.90052    16.29935          1         56
     st_case |     45,136    279665.4    162966.8      10001     560131
      veh_no |     45,136    1.441532     1.00127          1         40
    drimpair |     45,136    24.72909    41.49796          0         99

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