Summary statistics for icd9sg2011 dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     prcdrcd |          0
   shortdesc |          0
     version |      3,859          28           0         28         28
       fyear |      3,859        2011           0       2011       2011

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