Summary statistics for a_c6_4 variable in snf_rollup2540_96_2007 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c6_4 | 12,366 -162224.2 491773.2 -7661812 2.61e+07 by Jean Roth , jroth@nber.org , 17 Feb 2018