Summary statistics for icd2cchcc22xw2015 dataset : by Jean Roth , jroth@nber.org , 12 Jan 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- icd | 0 cc | 0 icdvers | 3,033 9 0 9 9 modtype | 0 modvers | 3,033 22 0 22 22 -------------+--------------------------------------------------------- year | 3,033 2015 0 2015 2015 by Jean Roth , jroth@nber.org , 12 Jan 2016