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
0.09	5
0.10	6
0.11	7
0.11	8
0.13	9
0.13	10
0.15	11
0.16	12
0.17	13
0.18	14
0.20	15
0.21	16
0.23	17
0.26	18
0.29	19
0.31	20
0.34	21
0.38	22
0.41	23
0.44	24
0.47	25
0.51	26
0.53	27
0.56	28
0.58	29
0.60	30
0.63	31
0.65	32
0.68	33
0.69	34
0.72	35
0.73	36
0.76	37
0.77	38
0.80	39
0.83	40
0.84	41
0.88	42
0.90	43
0.91	44
0.94	45
1.01	46
1.02	47
1.03	48
1.05	49
1.10	50
1.11	51
1.13	52
1.17	53
1.21	54
1.25	55
1.26	56
1.29	57
1.34	58
1.38	59
1.43	60
1.43	61
1.47	62
1.53	63
1.56	64
1.60	65
1.67	66
1.68	67
1.72	68
1.77	69
1.82	70
1.87	71
1.94	72
2.01	73
2.03	74
2.06	75
2.15	76
2.20	77
2.23	78
2.31	79
2.40	80
2.50	81
2.52	82
2.63	83
2.73	84
2.82	85
2.94	86
3.03	87
3.15	88
3.32	89
3.40	90
3.58	91
3.77	92
4.02	93
4.29	94
4.56	95
4.94	96
5.46	97
6.20	98
7.56	99
15.54	100