Summary statistics for nadacc20170510 dataset : by Jean Roth , jroth@nber.org , 10 Feb 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- ndcdescrip~n | 0 ndc | 0 oldnadacpe~t | 67 112.6572 334.7822 .82978 1500.456 newnadacpe~t | 67 117.1195 341.2651 .85206 1506.86 classifica~g | 0 -------------+--------------------------------------------------------- percentcha~e | 67 10.70701 22.30385 -3.11 187.89 percentcha~r | 0 primaryrea~n | 0 startdate | 67 20942 0 20942 20942 enddate | 67 20949 0 20949 20949 -------------+--------------------------------------------------------- year | 67 2017 0 2017 2017 month | 67 5 0 5 5 day | 67 10 0 10 10 by Jean Roth , jroth@nber.org , 10 Feb 2018