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
0.06	1
0.07	2
0.08	3
0.09	4
0.09	5
0.10	6
0.11	7
0.12	8
0.13	9
0.14	10
0.15	11
0.17	12
0.18	13
0.20	14
0.22	15
0.25	16
0.27	17
0.29	18
0.34	19
0.36	20
0.40	21
0.43	22
0.45	23
0.48	24
0.51	25
0.53	26
0.56	27
0.58	28
0.60	29
0.63	30
0.64	31
0.67	32
0.69	33
0.72	34
0.73	35
0.76	36
0.77	37
0.80	38
0.82	39
0.84	40
0.87	41
0.90	42
0.91	43
0.93	44
1.01	45
1.02	46
1.03	47
1.05	48
1.10	49
1.11	50
1.12	51
1.17	52
1.21	53
1.23	54
1.26	55
1.27	56
1.33	57
1.36	58
1.40	59
1.43	60
1.43	61
1.51	62
1.54	63
1.58	64
1.65	65
1.67	66
1.69	67
1.77	68
1.82	69
1.84	70
1.90	71
2.01	72
2.02	73
2.04	74
2.12	75
2.17	76
2.22	77
2.30	78
2.35	79
2.44	80
2.51	81
2.58	82
2.68	83
2.76	84
2.86	85
3.01	86
3.04	87
3.21	88
3.34	89
3.45	90
3.64	91
3.82	92
4.04	93
4.29	94
4.57	95
5.04	96
5.58	97
6.33	98
7.59	99
15.70	100