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
0.03	1
0.04	2
0.05	3
0.05	4
0.06	5
0.07	6
0.08	7
0.09	8
0.09	9
0.10	10
0.11	11
0.13	12
0.14	13
0.15	14
0.17	15
0.19	16
0.20	17
0.22	18
0.23	19
0.25	20
0.27	21
0.28	22
0.30	23
0.31	24
0.34	25
0.35	26
0.37	27
0.38	28
0.40	29
0.42	30
0.44	31
0.46	32
0.48	33
0.50	34
0.52	35
0.54	36
0.56	37
0.58	38
0.60	39
0.62	40
0.64	41
0.66	42
0.68	43
0.70	44
0.72	45
0.75	46
0.77	47
0.79	48
0.82	49
0.84	50
0.88	51
0.91	52
0.94	53
0.96	54
1.01	55
1.04	56
1.06	57
1.09	58
1.13	59
1.16	60
1.19	61
1.24	62
1.27	63
1.32	64
1.35	65
1.40	66
1.44	67
1.48	68
1.53	69
1.59	70
1.64	71
1.68	72
1.74	73
1.79	74
1.85	75
1.91	76
1.98	77
2.05	78
2.13	79
2.20	80
2.29	81
2.37	82
2.46	83
2.55	84
2.65	85
2.77	86
2.87	87
3.02	88
3.17	89
3.32	90
3.48	91
3.67	92
3.91	93
4.14	94
4.41	95
4.76	96
5.21	97
5.83	98
6.79	99
11.06	100