Summary statistics for icd2ccpace21xw2012 dataset : by Jean Roth , jroth@nber.org , 12 Jan 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- icd | 0 cc | 0 icdvers | 3,172 9 0 9 9 modtype | 0 modvers | 3,172 21 0 21 21 -------------+--------------------------------------------------------- year | 3,172 2012 0 2012 2012 by Jean Roth , jroth@nber.org , 12 Jan 2016