Summary statistics for icd9sg2009 dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     prcdrcd |          0
   shortdesc |          0
     version |      3,824          26           0         26         26
       fyear |      3,824        2009           0       2009       2009

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