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
0.03	1
0.04	2
0.05	3
0.05	4
0.06	5
0.07	6
0.08	7
0.09	8
0.10	9
0.11	10
0.12	11
0.13	12
0.14	13
0.16	14
0.17	15
0.19	16
0.21	17
0.22	18
0.23	19
0.25	20
0.26	21
0.28	22
0.29	23
0.31	24
0.33	25
0.35	26
0.37	27
0.38	28
0.40	29
0.42	30
0.44	31
0.46	32
0.47	33
0.50	34
0.52	35
0.53	36
0.55	37
0.57	38
0.60	39
0.62	40
0.64	41
0.67	42
0.68	43
0.70	44
0.72	45
0.75	46
0.77	47
0.79	48
0.82	49
0.84	50
0.88	51
0.89	52
0.92	53
0.95	54
1.00	55
1.01	56
1.04	57
1.07	58
1.11	59
1.15	60
1.19	61
1.22	62
1.26	63
1.30	64
1.34	65
1.38	66
1.42	67
1.47	68
1.52	69
1.56	70
1.62	71
1.67	72
1.73	73
1.78	74
1.84	75
1.91	76
2.00	77
2.05	78
2.11	79
2.19	80
2.26	81
2.35	82
2.44	83
2.54	84
2.64	85
2.75	86
2.88	87
3.01	88
3.15	89
3.31	90
3.47	91
3.67	92
3.88	93
4.12	94
4.40	95
4.76	96
5.23	97
5.82	98
6.72	99
12.56	100