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
0.11	8
0.13	9
0.13	10
0.14	11
0.15	12
0.16	13
0.17	14
0.17	15
0.19	16
0.20	17
0.21	18
0.22	19
0.23	20
0.24	21
0.26	22
0.27	23
0.29	24
0.30	25
0.33	26
0.34	27
0.37	28
0.39	29
0.41	30
0.45	31
0.47	32
0.51	33
0.54	34
0.57	35
0.60	36
0.63	37
0.67	38
0.68	39
0.71	40
0.72	41
0.76	42
0.78	43
0.81	44
0.84	45
0.86	46
0.91	47
0.91	48
0.94	49
1.01	50
1.02	51
1.03	52
1.09	53
1.11	54
1.12	55
1.17	56
1.21	57
1.25	58
1.26	59
1.30	60
1.34	61
1.38	62
1.43	63
1.43	64
1.47	65
1.54	66
1.58	67
1.63	68
1.67	69
1.68	70
1.76	71
1.82	72
1.84	73
1.90	74
2.01	75
2.02	76
2.03	77
2.13	78
2.18	79
2.22	80
2.31	81
2.36	82
2.46	83
2.51	84
2.63	85
2.73	86
2.81	87
2.91	88
3.03	89
3.15	90
3.33	91
3.44	92
3.68	93
3.94	94
4.20	95
4.58	96
5.05	97
5.84	98
7.03	99
13.00	100