Summary statistics for a_c2_18 variable in hosp_rollup2552_96_2006 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c2_18 | 3,109 145861.3 698331.3 -142886 2.18e+07 by Jean Roth , jroth@nber.org , 21 Apr 2018