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
0.01	1
0.02	2
0.02	3
0.02	4
0.03	5
0.03	6
0.03	7
0.04	8
0.05	9
0.05	10
0.06	11
0.07	12
0.07	13
0.08	14
0.08	15
0.09	16
0.10	17
0.10	18
0.11	19
0.11	20
0.12	21
0.13	22
0.13	23
0.14	24
0.14	25
0.15	26
0.15	27
0.16	28
0.16	29
0.17	30
0.17	31
0.18	32
0.18	33
0.19	34
0.20	35
0.20	36
0.21	37
0.21	38
0.22	39
0.23	40
0.23	41
0.24	42
0.24	43
0.25	44
0.26	45
0.26	46
0.27	47
0.28	48
0.28	49
0.29	50
0.30	51
0.31	52
0.32	53
0.33	54
0.33	55
0.34	56
0.35	57
0.36	58
0.37	59
0.38	60
0.39	61
0.41	62
0.42	63
0.43	64
0.44	65
0.45	66
0.46	67
0.48	68
0.49	69
0.50	70
0.51	71
0.53	72
0.54	73
0.56	74
0.58	75
0.59	76
0.61	77
0.63	78
0.65	79
0.67	80
0.69	81
0.71	82
0.74	83
0.77	84
0.80	85
0.83	86
0.86	87
0.90	88
0.94	89
0.98	90
1.04	91
1.10	92
1.18	93
1.25	94
1.37	95
1.50	96
1.72	97
2.03	98
2.63	99
11.57	100