Summary statistics for nmimpair dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |        119          43           0         43         43
     st_case |        119    430159.7    82.57407     430001     430287
      veh_no |        119           0           0          0          0
      per_no |        119    1.092437     .318673          1          3
    nmimpair |        119           0           0          0          0

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