Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      5,724     25.6775     16.1949          1         56
     st_case |      5,724    257500.6    161839.5      10009     560119
      veh_no |      5,724           0           0          0          0
      per_no |      5,724    1.101153    .3944469          1          6
    nmimpair |      5,724    36.71698     46.4116          0         99

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