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
0.01	4
0.02	5
0.02	6
0.03	7
0.03	8
0.04	9
0.04	10
0.04	11
0.05	12
0.05	13
0.06	14
0.06	15
0.07	16
0.07	17
0.08	18
0.08	19
0.09	20
0.09	21
0.10	22
0.10	23
0.11	24
0.11	25
0.12	26
0.12	27
0.13	28
0.13	29
0.14	30
0.14	31
0.15	32
0.16	33
0.16	34
0.17	35
0.17	36
0.18	37
0.18	38
0.19	39
0.20	40
0.21	41
0.21	42
0.22	43
0.22	44
0.23	45
0.24	46
0.25	47
0.25	48
0.26	49
0.27	50
0.28	51
0.28	52
0.29	53
0.30	54
0.30	55
0.31	56
0.32	57
0.33	58
0.34	59
0.35	60
0.36	61
0.37	62
0.38	63
0.39	64
0.40	65
0.41	66
0.42	67
0.44	68
0.45	69
0.47	70
0.48	71
0.50	72
0.51	73
0.53	74
0.55	75
0.57	76
0.59	77
0.61	78
0.63	79
0.65	80
0.67	81
0.69	82
0.71	83
0.75	84
0.78	85
0.81	86
0.85	87
0.91	88
0.95	89
0.99	90
1.05	91
1.13	92
1.18	93
1.26	94
1.37	95
1.52	96
1.70	97
1.98	98
2.41	99
5.94	100