Summary statistics for icd2cchcc12xw2013 dataset : by Jean Roth , jroth@nber.org , 12 Jan 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- icd | 0 cc | 0 icdvers | 2,938 9 0 9 9 modtype | 0 modvers | 2,938 12 0 12 12 -------------+--------------------------------------------------------- year | 2,938 2013 0 2013 2013 by Jean Roth , jroth@nber.org , 12 Jan 2016