Summary statistics for vsoe dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |    107,734    28.03895    16.30538          1         56
     st_case |    107,734    280976.7      163021      10001     560139
      veh_no |    107,734    1.284896    .6365333          1         15
   veventnum |    107,734    2.310366    1.634764          1         20
         soe |    107,734    33.75116    25.26171          1         99
-------------+---------------------------------------------------------
         aoi |    107,734    28.73882    27.07919          0         99

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