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
0.08	1
0.10	2
0.11	3
0.13	4
0.15	5
0.17	6
0.17	7
0.20	8
0.20	9
0.22	10
0.25	11
0.26	12
0.28	13
0.30	14
0.34	15
0.34	16
0.35	17
0.38	18
0.41	19
0.43	20
0.47	21
0.51	22
0.52	23
0.56	24
0.60	25
0.63	26
0.67	27
0.70	28
0.74	29
0.78	30
0.81	31
0.85	32
0.88	33
0.92	34
1.01	35
1.02	36
1.03	37
1.07	38
1.13	39
1.17	40
1.17	41
1.23	42
1.27	43
1.31	44
1.37	45
1.40	46
1.41	47
1.47	48
1.52	49
1.57	50
1.62	51
1.67	52
1.74	53
1.76	54
1.76	55
1.81	56
1.89	57
2.00	58
2.02	59
2.03	60
2.10	61
2.17	62
2.25	63
2.33	64
2.34	65
2.34	66
2.40	67
2.51	68
2.58	69
2.63	70
2.70	71
2.80	72
2.87	73
3.01	74
3.03	75
3.11	76
3.21	77
3.34	78
3.45	79
3.51	80
3.61	81
3.75	82
3.89	83
4.02	84
4.19	85
4.29	86
4.51	87
4.67	88
4.80	89
5.03	90
5.26	91
5.51	92
5.78	93
6.12	94
6.58	95
7.03	96
7.68	97
8.66	98
10.22	99
23.38	100