Summary statistics for nadac20170531 dataset : by Jean Roth , jroth@nber.org , 10 Feb 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- ndcdescrip~n | 0 ndc | 0 nadac_per_~t | 24,526 9.434018 209.4933 .00132 18280.92 effective_~e | 24,526 20937.24 53.68292 20592 20970 pricing_unit | 0 -------------+--------------------------------------------------------- pharmacy_t~r | 0 otc | 0 explanatio~e | 0 classifica~g | 0 correspond~c | 1,198 4.302683 19.45207 .00295 375.8062 -------------+--------------------------------------------------------- asofdate | 24,526 20970 0 20970 20970 year | 24,526 2017 0 2017 2017 month | 24,526 5 0 5 5 day | 24,526 31 0 31 31 generic_dr~e | 0 -------------+--------------------------------------------------------- generic_dr~c | 1,198 20946.55 40.70456 20592 20970 by Jean Roth , jroth@nber.org , 10 Feb 2018