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
0.07	1
0.08	2
0.09	3
0.10	4
0.12	5
0.13	6
0.15	7
0.17	8
0.20	9
0.22	10
0.25	11
0.27	12
0.29	13
0.31	14
0.34	15
0.37	16
0.39	17
0.41	18
0.43	19
0.46	20
0.50	21
0.51	22
0.53	23
0.55	24
0.57	25
0.60	26
0.61	27
0.63	28
0.67	29
0.68	30
0.69	31
0.72	32
0.74	33
0.76	34
0.77	35
0.80	36
0.82	37
0.84	38
0.86	39
0.90	40
0.91	41
0.93	42
1.00	43
1.01	44
1.02	45
1.03	46
1.08	47
1.11	48
1.12	49
1.14	50
1.18	51
1.21	52
1.25	53
1.26	54
1.30	55
1.34	56
1.38	57
1.43	58
1.43	59
1.46	60
1.52	61
1.56	62
1.60	63
1.65	64
1.67	65
1.71	66
1.77	67
1.82	68
1.86	69
1.91	70
2.01	71
2.02	72
2.04	73
2.12	74
2.17	75
2.22	76
2.27	77
2.31	78
2.41	79
2.51	80
2.56	81
2.64	82
2.73	83
2.82	84
2.91	85
3.03	86
3.11	87
3.26	88
3.35	89
3.55	90
3.72	91
3.91	92
4.15	93
4.35	94
4.72	95
5.13	96
5.67	97
6.56	98
8.05	99
19.00	100