Summary statistics for icd9dx2008 dataset : by Jean Roth , jroth@nber.org , 27 Apr 2017 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- dgns_cd | 0 shortdesc | 0 version | 13,677 25 0 25 25 fyear | 13,677 2008 0 2008 2008 by Jean Roth , jroth@nber.org , 27 Apr 2017