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
0.00	1
0.01	2
0.01	3
0.02	4
0.02	5
0.02	6
0.03	7
0.03	8
0.03	9
0.04	10
0.04	11
0.05	12
0.05	13
0.06	14
0.06	15
0.06	16
0.07	17
0.07	18
0.08	19
0.08	20
0.09	21
0.09	22
0.10	23
0.10	24
0.11	25
0.11	26
0.12	27
0.13	28
0.13	29
0.14	30
0.14	31
0.15	32
0.15	33
0.16	34
0.16	35
0.17	36
0.17	37
0.18	38
0.18	39
0.19	40
0.20	41
0.20	42
0.21	43
0.22	44
0.22	45
0.23	46
0.24	47
0.24	48
0.25	49
0.26	50
0.27	51
0.27	52
0.28	53
0.29	54
0.30	55
0.30	56
0.31	57
0.32	58
0.33	59
0.34	60
0.35	61
0.36	62
0.37	63
0.38	64
0.39	65
0.40	66
0.42	67
0.43	68
0.44	69
0.45	70
0.47	71
0.48	72
0.50	73
0.52	74
0.53	75
0.55	76
0.56	77
0.58	78
0.61	79
0.63	80
0.65	81
0.68	82
0.71	83
0.73	84
0.76	85
0.79	86
0.83	87
0.87	88
0.92	89
0.96	90
1.02	91
1.10	92
1.17	93
1.27	94
1.37	95
1.50	96
1.68	97
1.93	98
2.30	99
5.33	100