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
0.08	3
0.09	4
0.10	5
0.11	6
0.12	7
0.13	8
0.15	9
0.17	10
0.17	11
0.21	12
0.23	13
0.27	14
0.30	15
0.34	16
0.36	17
0.39	18
0.42	19
0.45	20
0.47	21
0.51	22
0.52	23
0.55	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
0.75	34
0.77	35
0.78	36
0.81	37
0.83	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
1.05	47
1.09	48
1.11	49
1.12	50
1.17	51
1.20	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
1.52	61
1.56	62
1.59	63
1.64	64
1.67	65
1.69	66
1.76	67
1.81	68
1.84	69
1.88	70
2.00	71
2.02	72
2.03	73
2.10	74
2.16	75
2.22	76
2.27	77
2.33	78
2.40	79
2.50	80
2.52	81
2.61	82
2.73	83
2.81	84
2.89	85
3.02	86
3.12	87
3.26	88
3.34	89
3.52	90
3.69	91
3.85	92
4.04	93
4.33	94
4.62	95
5.05	96
5.60	97
6.38	98
7.78	99
16.13	100