Summary statistics for d4_hos_c2_30 variable in hosp_rollup2552_96_2009 dataset Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- d4_hos_c2_30 | 113 1.14e+07 2.60e+07 187 1.48e+08 by Jean Roth , jroth@nber.org , 21 Apr 2018