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
0.01	1
0.02	2
0.02	3
0.03	4
0.03	5
0.04	6
0.05	7
0.05	8
0.06	9
0.07	10
0.07	11
0.08	12
0.09	13
0.09	14
0.10	15
0.11	16
0.12	17
0.13	18
0.14	19
0.15	20
0.15	21
0.16	22
0.17	23
0.18	24
0.19	25
0.20	26
0.21	27
0.22	28
0.23	29
0.24	30
0.25	31
0.26	32
0.27	33
0.29	34
0.30	35
0.31	36
0.32	37
0.33	38
0.34	39
0.36	40
0.37	41
0.38	42
0.39	43
0.40	44
0.42	45
0.43	46
0.45	47
0.46	48
0.48	49
0.49	50
0.51	51
0.53	52
0.54	53
0.56	54
0.58	55
0.60	56
0.62	57
0.64	58
0.66	59
0.68	60
0.70	61
0.72	62
0.75	63
0.77	64
0.80	65
0.83	66
0.85	67
0.88	68
0.91	69
0.94	70
0.97	71
1.00	72
1.04	73
1.07	74
1.11	75
1.15	76
1.19	77
1.24	78
1.28	79
1.33	80
1.38	81
1.43	82
1.50	83
1.57	84
1.63	85
1.69	86
1.78	87
1.86	88
1.95	89
2.04	90
2.15	91
2.28	92
2.45	93
2.64	94
2.85	95
3.12	96
3.43	97
3.90	98
4.79	99
10.15	100