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
0.02	4
0.03	5
0.03	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
0.10	16
0.11	17
0.11	18
0.12	19
0.12	20
0.13	21
0.14	22
0.14	23
0.15	24
0.15	25
0.16	26
0.16	27
0.17	28
0.17	29
0.18	30
0.18	31
0.19	32
0.20	33
0.20	34
0.21	35
0.22	36
0.22	37
0.23	38
0.23	39
0.24	40
0.24	41
0.25	42
0.26	43
0.26	44
0.27	45
0.28	46
0.29	47
0.29	48
0.30	49
0.31	50
0.32	51
0.33	52
0.34	53
0.34	54
0.35	55
0.36	56
0.37	57
0.38	58
0.39	59
0.40	60
0.41	61
0.42	62
0.43	63
0.45	64
0.46	65
0.47	66
0.48	67
0.49	68
0.50	69
0.52	70
0.54	71
0.55	72
0.57	73
0.58	74
0.60	75
0.62	76
0.64	77
0.66	78
0.68	79
0.70	80
0.73	81
0.75	82
0.77	83
0.80	84
0.83	85
0.87	86
0.91	87
0.94	88
0.98	89
1.03	90
1.09	91
1.17	92
1.25	93
1.35	94
1.45	95
1.59	96
1.80	97
2.13	98
2.95	99
13.75	100