Summary statistics for icd9sg2007 dataset :

by Jean Roth , jroth@nber.org , 27 Apr 2017

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     prcdrcd |          0
   shortdesc |          0
     version |      3,733          24           0         24         24
       fyear |      3,733        2007           0       2007       2007

by Jean Roth , jroth@nber.org , 27 Apr 2017