Summary statistics for miper dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 64,636 2003 0 2003 2003 st_case | 64,636 272455.1 161242 10001 560141 veh_no | 64,636 1.320224 1.077287 0 45 per_no | 64,636 1.056996 1.444575 1 74 p1 | 64,636 4.23193 8.3894 0 77 -------------+--------------------------------------------------------- p2 | 64,636 4.20928 8.384258 0 77 p3 | 64,636 4.267993 8.449503 0 77 p4 | 64,636 4.216861 8.377499 0 77 p5 | 64,636 4.238598 8.41352 0 77 p6 | 64,636 4.219645 8.409831 0 77 -------------+--------------------------------------------------------- p7 | 64,636 4.196036 8.375617 0 77 p8 | 64,636 4.20241 8.380132 0 77 p9 | 64,636 4.221982 8.386159 0 77 p10 | 64,636 4.274073 8.441947 0 77 by Jean Roth , jroth@nber.org , 18 Apr 2016