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
0.05	7
0.06	8
0.06	9
0.07	10
0.08	11
0.08	12
0.09	13
0.09	14
0.10	15
0.10	16
0.11	17
0.12	18
0.12	19
0.13	20
0.13	21
0.14	22
0.14	23
0.15	24
0.15	25
0.16	26
0.17	27
0.17	28
0.18	29
0.18	30
0.19	31
0.19	32
0.20	33
0.20	34
0.21	35
0.22	36
0.22	37
0.23	38
0.24	39
0.24	40
0.25	41
0.25	42
0.26	43
0.27	44
0.27	45
0.28	46
0.29	47
0.30	48
0.30	49
0.31	50
0.32	51
0.33	52
0.34	53
0.35	54
0.36	55
0.36	56
0.38	57
0.38	58
0.39	59
0.41	60
0.42	61
0.43	62
0.44	63
0.45	64
0.46	65
0.47	66
0.48	67
0.50	68
0.51	69
0.53	70
0.54	71
0.56	72
0.57	73
0.59	74
0.61	75
0.63	76
0.64	77
0.67	78
0.69	79
0.71	80
0.73	81
0.76	82
0.79	83
0.82	84
0.85	85
0.89	86
0.93	87
0.97	88
1.02	89
1.08	90
1.14	91
1.20	92
1.27	93
1.38	94
1.49	95
1.64	96
1.84	97
2.23	98
2.98	99
14.87	100