Summary statistics for a_c2_5 variable in snf_rollup2540_96_2006 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c2_5 | 12,927 311086.2 399982.3 -7678 1.64e+07 by Jean Roth , jroth@nber.org , 17 Feb 2018