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
0.08	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
0.17	13
0.20	14
0.21	15
0.23	16
0.26	17
0.28	18
0.31	19
0.34	20
0.37	21
0.41	22
0.43	23
0.46	24
0.50	25
0.52	26
0.55	27
0.57	28
0.59	29
0.61	30
0.64	31
0.67	32
0.68	33
0.70	34
0.72	35
0.75	36
0.77	37
0.79	38
0.82	39
0.84	40
0.86	41
0.90	42
0.91	43
0.92	44
1.00	45
1.01	46
1.02	47
1.03	48
1.08	49
1.11	50
1.12	51
1.15	52
1.20	53
1.23	54
1.25	55
1.27	56
1.32	57
1.36	58
1.40	59
1.43	60
1.45	61
1.51	62
1.55	63
1.58	64
1.67	65
1.67	66
1.69	67
1.77	68
1.82	69
1.85	70
1.90	71
2.01	72
2.02	73
2.04	74
2.14	75
2.19	76
2.22	77
2.30	78
2.34	79
2.44	80
2.51	81
2.58	82
2.70	83
2.76	84
2.86	85
3.01	86
3.08	87
3.24	88
3.34	89
3.51	90
3.68	91
3.88	92
4.08	93
4.31	94
4.62	95
5.03	96
5.57	97
6.31	98
7.72	99
15.18	100