Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      5,490    25.48379    15.98611          1         56
     st_case |      5,490    255545.4      159772      10022     560061
      veh_no |      5,490           0           0          0          0
      per_no |      5,490    1.106557    .4657448          1          8
    nmimpair |      5,490    26.10328    41.80343          0         99

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