Summary statistics for d_4_hos_c6_56 variable in hosp_rollup2552_96_1996 datase Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- d_4_hos_c6~6 | 4 9640374 1.28e+07 1304672 2.86e+07 by Jean Roth , jroth@nber.org , 3 Sep 2018