Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      6,246    25.94765    16.15662          1         56
     st_case |      6,246    260224.4    161466.5      10006     560100
      veh_no |      6,246           0           0          0          0
      per_no |      6,246    1.123919    .4881439          1          9
    nmimpair |      6,246    37.90586    46.66591          0         99

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