Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      6,373    24.98196    16.28296          1         56
     st_case |      6,373    250595.6    162702.8      10015     560111
      veh_no |      6,373           0           0          0          0
      per_no |      6,373    1.207124    1.104164          1         21
    nmimpair |      6,373    47.02871     48.1755          0         99

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