Summary statistics for indi2010q4 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 315612 7113201 54654.15 6816342 7301355 indi_drug_~q | 315612 1.02e+09 191333.7 1.01e+09 1.02e+09 indi_pt | 0 by Jean Roth , jroth@nber.org , 18 Dec 2015