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
0.36	1
0.48	2
0.55	3
0.60	4
0.66	5
0.79	6
0.86	7
0.92	8
0.98	9
1.04	10
1.11	11
1.18	12
1.24	13
1.29	14
1.34	15
1.39	16
1.43	17
1.46	18
1.52	19
1.57	20
1.61	21
1.65	22
1.68	23
1.70	24
1.74	25
1.77	26
1.80	27
1.84	28
1.88	29
1.91	30
1.98	31
2.03	32
2.07	33
2.12	34
2.16	35
2.18	36
2.21	37
2.23	38
2.27	39
2.32	40
2.36	41
2.42	42
2.45	43
2.50	44
2.52	45
2.56	46
2.60	47
2.64	48
2.68	49
2.73	50
2.78	51
2.82	52
2.87	53
2.94	54
3.00	55
3.05	56
3.10	57
3.14	58
3.20	59
3.26	60
3.32	61
3.38	62
3.44	63
3.51	64
3.60	65
3.66	66
3.73	67
3.84	68
3.92	69
4.02	70
4.08	71
4.14	72
4.26	73
4.35	74
4.44	75
4.53	76
4.63	77
4.75	78
4.86	79
5.04	80
5.20	81
5.35	82
5.56	83
5.71	84
5.83	85
6.05	86
6.19	87
6.43	88
6.78	89
6.94	90
7.22	91
7.68	92
8.35	93
9.22	94
9.83	95
10.67	96
12.31	97
15.49	98
27.88	99
894.00	100