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
0.06	1
0.07	2
0.08	3
0.09	4
0.10	5
0.10	6
0.12	7
0.13	8
0.14	9
0.15	10
0.17	11
0.19	12
0.21	13
0.25	14
0.28	15
0.31	16
0.34	17
0.38	18
0.41	19
0.43	20
0.46	21
0.50	22
0.52	23
0.54	24
0.56	25
0.58	26
0.60	27
0.62	28
0.64	29
0.67	30
0.68	31
0.70	32
0.72	33
0.76	34
0.77	35
0.79	36
0.82	37
0.84	38
0.85	39
0.88	40
0.90	41
0.91	42
0.95	43
1.01	44
1.02	45
1.03	46
1.06	47
1.10	48
1.11	49
1.13	50
1.18	51
1.22	52
1.25	53
1.26	54
1.29	55
1.34	56
1.38	57
1.43	58
1.43	59
1.46	60
1.51	61
1.54	62
1.58	63
1.65	64
1.67	65
1.71	66
1.77	67
1.82	68
1.86	69
1.89	70
2.01	71
2.02	72
2.03	73
2.10	74
2.15	75
2.22	76
2.26	77
2.31	78
2.40	79
2.50	80
2.52	81
2.63	82
2.73	83
2.84	84
2.92	85
3.03	86
3.14	87
3.29	88
3.36	89
3.54	90
3.71	91
3.89	92
4.12	93
4.35	94
4.64	95
5.09	96
5.71	97
6.42	98
7.76	99
17.20	100