Summary statistics for b_1_c18_21 variable in snf_rollup2540_96_2006 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- b_1_c18_21 | 10,936 15657.38 38446.58 -14037 2042757 by Jean Roth , jroth@nber.org , 17 Feb 2018