Summary statistics for a_c6_4 variable in snf_rollup2540_96_1998 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c6_4 | 12,500 -73446.24 365932.5 -1.61e+07 3884471 by Jean Roth , jroth@nber.org , 17 Feb 2018