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
0.00	1
0.00	2
0.00	3
0.01	4
0.01	5
0.01	6
0.01	7
0.02	8
0.02	9
0.02	10
0.03	11
0.04	12
0.04	13
0.05	14
0.05	15
0.06	16
0.06	17
0.07	18
0.07	19
0.07	20
0.08	21
0.08	22
0.09	23
0.09	24
0.10	25
0.10	26
0.11	27
0.11	28
0.12	29
0.13	30
0.13	31
0.15	32
0.18	33
0.22	34
0.26	35
0.26	36
0.27	37
0.28	38
0.30	39
0.34	40
0.38	41
0.41	42
0.43	43
0.47	44
0.50	45
0.52	46
0.58	47
0.65	48
0.73	49
0.76	50
0.77	51
0.79	52
0.80	53
0.84	54
0.85	55
0.88	56
0.90	57
0.94	58
1.02	59
1.09	60
1.21	61
1.25	62
1.28	63
1.29	64
1.33	65
1.39	66
1.42	67
1.52	68
1.56	69
1.65	70
1.67	71
1.72	72
1.81	73
1.83	74
1.91	75
2.13	76
2.19	77
2.41	78
2.47	79
2.71	80
2.81	81
3.02	82
3.36	83
3.46	84
3.56	85
3.88	86
4.20	87
4.33	88
4.51	89
4.78	90
4.94	91
5.04	92
5.92	93
6.28	94
6.67	95
6.83	96
7.16	97
8.03	98
10.26	99
12.50	100