Summary statistics for icd9dx2011 dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     dgns_cd |          0
   shortdesc |          0
     version |     14,432          28           0         28         28
       fyear |     14,432        2011           0       2011       2011

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