Summary statistics for nmprior dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
       state |      6,420    25.23349    16.13192          1         56
     st_case |      6,420    253101.5    161196.7      10012     560074
      veh_no |      6,420           0           0          0          0
      per_no |      6,420    1.124922     .497041          1          9
     mpr_act |      6,420    10.21121    20.55966          1         99

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