Summary statistics for indi2004q4 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 97359 4507983 23555.33 4391150 4598178 indi_drug_~q | 97359 1.01e+09 89163.77 1.00e+09 1.01e+09 indi_pt | 0 by Jean Roth , jroth@nber.org , 18 Dec 2015