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
0.01	2
0.02	3
0.02	4
0.02	5
0.03	6
0.04	7
0.04	8
0.05	9
0.05	10
0.06	11
0.06	12
0.07	13
0.08	14
0.08	15
0.09	16
0.09	17
0.10	18
0.11	19
0.11	20
0.12	21
0.13	22
0.14	23
0.15	24
0.16	25
0.17	26
0.19	27
0.21	28
0.21	29
0.24	30
0.25	31
0.27	32
0.29	33
0.33	34
0.37	35
0.39	36
0.41	37
0.47	38
0.52	39
0.56	40
0.58	41
0.61	42
0.65	43
0.69	44
0.72	45
0.74	46
0.78	47
0.84	48
0.88	49
0.92	50
0.94	51
1.00	52
1.03	53
1.09	54
1.14	55
1.19	56
1.25	57
1.28	58
1.34	59
1.38	60
1.46	61
1.51	62
1.54	63
1.56	64
1.61	65
1.68	66
1.71	67
1.77	68
1.83	69
1.89	70
2.03	71
2.16	72
2.23	73
2.35	74
2.52	75
2.65	76
2.74	77
2.90	78
3.04	79
3.30	80
3.40	81
3.47	82
3.59	83
3.85	84
4.03	85
4.08	86
4.31	87
4.79	88
5.09	89
5.21	90
6.11	91
6.70	92
6.85	93
7.45	94
8.18	95
10.11	96
10.57	97
11.03	98
11.65	99
20.00	100