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
0.01	4
0.02	5
0.02	6
0.02	7
0.02	8
0.03	9
0.03	10
0.03	11
0.03	12
0.04	13
0.04	14
0.04	15
0.05	16
0.05	17
0.05	18
0.05	19
0.06	20
0.06	21
0.06	22
0.07	23
0.07	24
0.07	25
0.07	26
0.08	27
0.08	28
0.08	29
0.08	30
0.08	31
0.09	32
0.09	33
0.09	34
0.09	35
0.10	36
0.10	37
0.10	38
0.11	39
0.11	40
0.11	41
0.11	42
0.12	43
0.12	44
0.12	45
0.12	46
0.12	47
0.13	48
0.13	49
0.13	50
0.14	51
0.14	52
0.15	53
0.15	54
0.15	55
0.15	56
0.15	57
0.16	58
0.16	59
0.17	60
0.17	61
0.17	62
0.18	63
0.18	64
0.19	65
0.19	66
0.20	67
0.21	68
0.21	69
0.21	70
0.22	71
0.23	72
0.24	73
0.24	74
0.25	75
0.26	76
0.26	77
0.27	78
0.29	79
0.30	80
0.30	81
0.32	82
0.33	83
0.36	84
0.37	85
0.39	86
0.41	87
0.44	88
0.46	89
0.48	90
0.50	91
0.56	92
0.60	93
0.65	94
0.72	95
0.86	96
1.19	97
1.53	98
1.73	99
2.28	100