Summary statistics for icd9sg2002 dataset :

by Jean Roth , jroth@nber.org , 29 Jun 2017

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     dgns_cd |          0
   shortdesc |          0
     version |      4,299          19           0         19         19
       fyear |      4,299        2002           0       2002       2002

by Jean Roth , jroth@nber.org , 29 Jun 2017