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
0.02	7
0.03	8
0.03	9
0.03	10
0.03	11
0.03	12
0.04	13
0.04	14
0.04	15
0.04	16
0.05	17
0.05	18
0.05	19
0.05	20
0.05	21
0.05	22
0.06	23
0.06	24
0.06	25
0.06	26
0.06	27
0.07	28
0.07	29
0.07	30
0.07	31
0.08	32
0.08	33
0.08	34
0.08	35
0.09	36
0.09	37
0.09	38
0.09	39
0.10	40
0.10	41
0.10	42
0.10	43
0.11	44
0.11	45
0.11	46
0.12	47
0.12	48
0.12	49
0.12	50
0.13	51
0.13	52
0.13	53
0.14	54
0.14	55
0.14	56
0.15	57
0.15	58
0.15	59
0.16	60
0.16	61
0.17	62
0.17	63
0.18	64
0.18	65
0.18	66
0.19	67
0.19	68
0.20	69
0.20	70
0.21	71
0.22	72
0.22	73
0.23	74
0.23	75
0.24	76
0.25	77
0.25	78
0.26	79
0.27	80
0.28	81
0.29	82
0.31	83
0.32	84
0.32	85
0.34	86
0.35	87
0.37	88
0.39	89
0.41	90
0.44	91
0.48	92
0.51	93
0.56	94
0.63	95
0.71	96
0.83	97
1.07	98
1.64	99
6.44	100