Summary statistics for vision dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |     45,835    27.90614    16.11866          1         56
     st_case |     45,835    279658.6    161153.3      10001     560139
      veh_no |     45,835    1.439795    .7689457          1         15
    mvisobsc |     45,835    5.147769    21.51874          0         99

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