Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

Measure

Percentile

Measure	Percentile
0	0
0.07	1
0.08	2
0.09	3
0.10	4
0.11	5
0.13	6
0.15	7
0.17	8
0.18	9
0.20	10
0.23	11
0.26	12
0.28	13
0.31	14
0.34	15
0.36	16
0.38	17
0.41	18
0.43	19
0.46	20
0.50	21
0.51	22
0.53	23
0.55	24
0.57	25
0.60	26
0.61	27
0.63	28
0.67	29
0.68	30
0.69	31
0.72	32
0.74	33
0.76	34
0.78	35
0.80	36
0.82	37
0.84	38
0.86	39
0.90	40
0.91	41
0.94	42
1.00	43
1.01	44
1.02	45
1.03	46
1.09	47
1.11	48
1.12	49
1.15	50
1.19	51
1.22	52
1.25	53
1.26	54
1.30	55
1.35	56
1.39	57
1.43	58
1.43	59
1.47	60
1.52	61
1.57	62
1.61	63
1.67	64
1.68	65
1.72	66
1.77	67
1.82	68
1.86	69
1.91	70
2.01	71
2.02	72
2.04	73
2.13	74
2.17	75
2.23	76
2.31	77
2.35	78
2.45	79
2.51	80
2.58	81
2.67	82
2.73	83
2.84	84
2.92	85
3.03	86
3.16	87
3.29	88
3.41	89
3.57	90
3.76	91
4.00	92
4.21	93
4.45	94
4.79	95
5.15	96
5.68	97
6.48	98
8.07	99
19.00	100