Summary statistics for nmcrash dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- state | 7,163 25.50551 16.39768 1 56 st_case | 7,163 255772.8 163853.7 10009 560119 veh_no | 7,163 0 0 0 0 per_no | 7,163 1.086975 .362824 1 6 mtm_crsh | 7,163 11.19112 22.59594 0 99 by Jean Roth , jroth@nber.org , 18 Apr 2016