{
 "n": 256,
 "travel_ratio_median": 2.425084623442128,
 "travel_ratio_population": "arrived & 有老师参考（与 eval 的 okr 同口径）",
 "reverse_rate": {
  "p25": 0.15732546150684357,
  "p50": 0.23536035418510437,
  "p75": 0.3025793731212616
 },
 "net_over_travel_p50": 0.4447892699092449,
 "excursion_over_travel_p50": 0.5067885044066773,
 "still_rate_p50": 0.028846153989434242,
 "by_group": {
  "arrived": {
   "n": 147,
   "reverse_p50": 0.26143792271614075,
   "net_over_travel_p50": 0.47818613856136644,
   "excursion_p50": 0.5500977881151917
  },
  "failed": {
   "n": 109,
   "reverse_p50": 0.14653243124485016,
   "net_over_travel_p50": 0.3515762667187255,
   "excursion_p50": 0.39037085057225707
  }
 },
 "note": "net/行程 越接近 1 越\"单向\"；越小越来回抖。excursion/行程 = 各轴走过最大幅度的和 / 总行程，绕远时它接近 1、抖动时明显小于 1"
}