Summary statistics for b_1_c18_21 variable in snf_rollup2540_96_2005 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- b_1_c18_21 | 10,697 15088.03 41720.61 -5450 2002693 by Jean Roth , jroth@nber.org , 17 Feb 2018