Summary statistics for icd9dx2009 dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     dgns_cd |          0
   shortdesc |          0
     version |     14,025          26           0         26         26
       fyear |     14,025        2009           0       2009       2009

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