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
0.03	1
0.04	2
0.04	3
0.05	4
0.06	5
0.07	6
0.09	7
0.11	8
0.12	9
0.14	10
0.15	11
0.17	12
0.18	13
0.20	14
0.21	15
0.23	16
0.24	17
0.26	18
0.27	19
0.28	20
0.29	21
0.30	22
0.32	23
0.32	24
0.34	25
0.35	26
0.36	27
0.38	28
0.38	29
0.39	30
0.40	31
0.42	32
0.43	33
0.44	34
0.45	35
0.46	36
0.48	37
0.48	38
0.50	39
0.51	40
0.53	41
0.54	42
0.55	43
0.56	44
0.58	45
0.59	46
0.61	47
0.63	48
0.65	49
0.67	50
0.68	51
0.70	52
0.72	53
0.74	54
0.77	55
0.78	56
0.80	57
0.82	58
0.84	59
0.86	60
0.88	61
0.91	62
0.93	63
0.95	64
0.97	65
1.01	66
1.03	67
1.05	68
1.07	69
1.11	70
1.13	71
1.16	72
1.19	73
1.22	74
1.25	75
1.29	76
1.32	77
1.37	78
1.41	79
1.45	80
1.50	81
1.54	82
1.59	83
1.66	84
1.72	85
1.79	86
1.87	87
1.95	88
2.07	89
2.15	90
2.27	91
2.41	92
2.57	93
2.73	94
2.94	95
3.21	96
3.58	97
4.23	98
5.12	99
13.64	100