Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      6,193    25.17504    16.07615          1         56
     st_case |      6,193    252523.4    160636.1      10012     560074
      veh_no |      6,193           0           0          0          0
      per_no |      6,193    1.119328    .4870441          1          9
    nmimpair |      6,193    44.49104    47.86468          0         99

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