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
0.03	4
0.03	5
0.04	6
0.04	7
0.05	8
0.06	9
0.06	10
0.07	11
0.08	12
0.08	13
0.09	14
0.10	15
0.11	16
0.12	17
0.13	18
0.14	19
0.14	20
0.15	21
0.16	22
0.17	23
0.18	24
0.19	25
0.20	26
0.21	27
0.22	28
0.23	29
0.24	30
0.25	31
0.26	32
0.28	33
0.29	34
0.30	35
0.31	36
0.33	37
0.34	38
0.35	39
0.36	40
0.38	41
0.39	42
0.40	43
0.42	44
0.43	45
0.44	46
0.46	47
0.47	48
0.49	49
0.50	50
0.52	51
0.54	52
0.55	53
0.57	54
0.59	55
0.61	56
0.63	57
0.65	58
0.67	59
0.69	60
0.71	61
0.74	62
0.77	63
0.79	64
0.82	65
0.84	66
0.87	67
0.90	68
0.93	69
0.96	70
0.98	71
1.02	72
1.05	73
1.09	74
1.13	75
1.17	76
1.22	77
1.27	78
1.31	79
1.36	80
1.41	81
1.48	82
1.54	83
1.61	84
1.68	85
1.76	86
1.83	87
1.92	88
2.03	89
2.14	90
2.26	91
2.39	92
2.55	93
2.76	94
3.02	95
3.31	96
3.71	97
4.29	98
5.07	99
9.51	100