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
0.08	1
0.10	2
0.13	3
0.14	4
0.16	5
0.17	6
0.20	7
0.21	8
0.23	9
0.25	10
0.26	11
0.29	12
0.30	13
0.34	14
0.34	15
0.37	16
0.39	17
0.42	18
0.44	19
0.50	20
0.51	21
0.53	22
0.57	23
0.60	24
0.64	25
0.67	26
0.70	27
0.74	28
0.78	29
0.81	30
0.84	31
0.88	32
0.91	33
1.00	34
1.02	35
1.03	36
1.06	37
1.11	38
1.17	39
1.17	40
1.23	41
1.26	42
1.30	43
1.35	44
1.40	45
1.41	46
1.46	47
1.51	48
1.56	49
1.62	50
1.67	51
1.72	52
1.75	53
1.76	54
1.80	55
1.88	56
1.93	57
2.01	58
2.03	59
2.10	60
2.15	61
2.24	62
2.30	63
2.34	64
2.34	65
2.38	66
2.46	67
2.53	68
2.63	69
2.67	70
2.75	71
2.81	72
2.91	73
3.01	74
3.03	75
3.12	76
3.22	77
3.34	78
3.45	79
3.51	80
3.60	81
3.75	82
3.86	83
4.02	84
4.14	85
4.26	86
4.42	87
4.63	88
4.75	89
5.01	90
5.20	91
5.40	92
5.69	93
6.03	94
6.43	95
7.01	96
7.45	97
8.35	98
9.93	99
21.86	100