Summary statistics for icd9sg2014 dataset : by Jean Roth , jroth@nber.org , 27 Apr 2017 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- prcdrcd | 0 longdesc | 0 shortdesc | 0 version | 3,882 31 0 31 31 fyear | 3,882 2014 0 2014 2014 by Jean Roth , jroth@nber.org , 27 Apr 2017