Summary statistics for icd9dx2012 dataset : by Jean Roth , jroth@nber.org , 27 Apr 2017 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- dgns_cd | 0 shortdesc | 0 version | 14,567 29 0 29 29 fyear | 14,567 2012 0 2012 2012 by Jean Roth , jroth@nber.org , 27 Apr 2017