Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      6,933    25.53253    16.10794          1         56
     st_case |      6,933    256129.3    160958.5      10008     560123
      veh_no |      6,933           0           0          0          0
      per_no |      6,933    1.145103    .7015795          1         16
    nmimpair |      6,933    50.03418    48.31272          0         99

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