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
0.01	2
0.01	3
0.02	4
0.02	5
0.02	6
0.03	7
0.03	8
0.03	9
0.03	10
0.03	11
0.04	12
0.04	13
0.04	14
0.04	15
0.05	16
0.05	17
0.05	18
0.05	19
0.05	20
0.05	21
0.06	22
0.06	23
0.06	24
0.06	25
0.07	26
0.07	27
0.07	28
0.07	29
0.08	30
0.08	31
0.08	32
0.09	33
0.09	34
0.09	35
0.09	36
0.10	37
0.10	38
0.10	39
0.10	40
0.11	41
0.11	42
0.11	43
0.11	44
0.12	45
0.12	46
0.12	47
0.12	48
0.13	49
0.13	50
0.13	51
0.14	52
0.14	53
0.14	54
0.15	55
0.15	56
0.15	57
0.16	58
0.16	59
0.16	60
0.17	61
0.17	62
0.18	63
0.18	64
0.18	65
0.19	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
0.24	75
0.24	76
0.25	77
0.26	78
0.27	79
0.28	80
0.29	81
0.30	82
0.31	83
0.32	84
0.34	85
0.35	86
0.37	87
0.38	88
0.40	89
0.43	90
0.45	91
0.48	92
0.53	93
0.58	94
0.64	95
0.74	96
0.90	97
1.08	98
1.64	99
6.43	100