Summary statistics for a_c6_4 variable in snf_rollup2540_96_2004 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c6_4 | 12,255 -128740.4 444989.2 -7331094 2.35e+07 by Jean Roth , jroth@nber.org , 17 Feb 2018