Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 98,356 2.781274 .9217438 1 5 a_age2 | 98,356 3.820387 1.433993 1 6 a_age3 | 98,356 7.417799 2.575271 1 13 a_age4 | 98,356 4.272469 1.921956 1 8 a_age5 | 98,356 4.545925 2.333763 1 10 -------------+--------------------------------------------------------- a_age6 | 98,356 4.559457 2.315994 1 10 a_age7 | 98,356 6.468655 2.473571 1 12 a_age8 | 98,356 3.190532 1.775366 1 7 veh_no | 98,356 1.339542 .8192231 0 22 per_no | 98,356 1.697761 1.824902 1 53 -------------+--------------------------------------------------------- st_case | 98,356 266892.5 163730.7 10001 560169 year | 98,356 2006 0 2006 2006 a_ptype | 98,356 1.496736 .6841187 1 5 a_rest | 98,356 1.536602 .6426557 1 3 a_alctes | 98,356 2.56387 .9942019 1 5 -------------+--------------------------------------------------------- a_hisp | 98,356 .6187421 .8570444 0 3 a_rcat | 98,356 .9536581 1.930464 0 8 a_hrace | 98,356 1.35584 2.281962 0 9 a_eject | 98,356 1.130353 .3553228 1 3 a_perinj | 98,356 3.828907 2.478282 1 6 -------------+--------------------------------------------------------- a_loc | 98,356 1.111839 .4453771 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016