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
0.21	1
0.36	2
0.48	3
0.59	4
0.70	5
0.80	6
0.89	7
1.02	8
1.09	9
1.19	10
1.29	11
1.38	12
1.46	13
1.54	14
1.61	15
1.70	16
1.79	17
1.88	18
1.96	19
2.04	20
2.12	21
2.20	22
2.29	23
2.37	24
2.46	25
2.53	26
2.62	27
2.70	28
2.78	29
2.86	30
2.94	31
3.03	32
3.11	33
3.19	34
3.27	35
3.35	36
3.43	37
3.51	38
3.59	39
3.68	40
3.76	41
3.84	42
3.92	43
4.02	44
4.11	45
4.20	46
4.29	47
4.37	48
4.47	49
4.56	50
4.64	51
4.74	52
4.84	53
4.93	54
5.04	55
5.13	56
5.22	57
5.31	58
5.41	59
5.53	60
5.64	61
5.76	62
5.86	63
5.96	64
6.07	65
6.19	66
6.31	67
6.42	68
6.54	69
6.68	70
6.83	71
6.96	72
7.11	73
7.26	74
7.41	75
7.55	76
7.71	77
7.88	78
8.04	79
8.22	80
8.40	81
8.64	82
8.84	83
9.05	84
9.26	85
9.51	86
9.75	87
10.04	88
10.33	89
10.69	90
11.05	91
11.42	92
11.84	93
12.35	94
12.90	95
13.71	96
14.65	97
15.91	98
17.96	99
28.44	100