Summary statistics for miper dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 64,304 2002 0 2002 2002 st_case | 64,304 273536.1 161093.9 10001 560151 veh_no | 64,304 1.350336 1.625954 0 58 per_no | 64,304 1.015551 .1935321 1 11 p1 | 64,304 4.35046 8.44786 0 69 -------------+--------------------------------------------------------- p2 | 64,304 4.364316 8.502347 0 69 p3 | 64,304 4.340725 8.46286 0 69 p4 | 64,304 4.361813 8.482482 0 69 p5 | 64,304 4.317772 8.411163 0 69 p6 | 64,304 4.324226 8.437762 0 74 -------------+--------------------------------------------------------- p7 | 64,304 4.35609 8.455375 0 69 p8 | 64,304 4.326698 8.445839 0 69 p9 | 64,304 4.306668 8.410536 0 71 p10 | 64,304 4.323386 8.431074 0 69 by Jean Roth , jroth@nber.org , 18 Apr 2016