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
0.03	1
0.04	2
0.05	3
0.05	4
0.06	5
0.07	6
0.08	7
0.09	8
0.10	9
0.11	10
0.12	11
0.13	12
0.14	13
0.16	14
0.17	15
0.19	16
0.21	17
0.22	18
0.24	19
0.25	20
0.27	21
0.29	22
0.30	23
0.32	24
0.34	25
0.35	26
0.37	27
0.39	28
0.40	29
0.42	30
0.44	31
0.46	32
0.48	33
0.50	34
0.52	35
0.54	36
0.56	37
0.58	38
0.60	39
0.62	40
0.65	41
0.67	42
0.69	43
0.71	44
0.73	45
0.76	46
0.78	47
0.80	48
0.82	49
0.85	50
0.88	51
0.91	52
0.94	53
0.96	54
1.01	55
1.03	56
1.06	57
1.09	58
1.13	59
1.17	60
1.20	61
1.24	62
1.27	63
1.31	64
1.36	65
1.39	66
1.44	67
1.49	68
1.53	69
1.58	70
1.63	71
1.68	72
1.74	73
1.80	74
1.86	75
1.92	76
2.00	77
2.04	78
2.11	79
2.20	80
2.28	81
2.36	82
2.46	83
2.55	84
2.67	85
2.78	86
2.92	87
3.03	88
3.17	89
3.32	90
3.50	91
3.69	92
3.91	93
4.15	94
4.42	95
4.76	96
5.23	97
5.77	98
6.81	99
12.73	100