Summary statistics for a_c2_5 variable in snf_rollup2540_96_2005 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c2_5 | 12,696 294732.1 375037.9 -132763 1.30e+07 by Jean Roth , jroth@nber.org , 17 Feb 2018