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
0.07	1
0.08	2
0.08	3
0.09	4
0.10	5
0.11	6
0.13	7
0.13	8
0.15	9
0.17	10
0.19	11
0.21	12
0.25	13
0.27	14
0.31	15
0.34	16
0.37	17
0.40	18
0.43	19
0.45	20
0.47	21
0.51	22
0.53	23
0.55	24
0.57	25
0.59	26
0.60	27
0.63	28
0.65	29
0.67	30
0.69	31
0.71	32
0.73	33
0.76	34
0.77	35
0.79	36
0.82	37
0.84	38
0.86	39
0.89	40
0.91	41
0.92	42
1.00	43
1.01	44
1.02	45
1.03	46
1.07	47
1.10	48
1.11	49
1.13	50
1.18	51
1.21	52
1.25	53
1.26	54
1.30	55
1.34	56
1.38	57
1.43	58
1.44	59
1.47	60
1.53	61
1.56	62
1.61	63
1.67	64
1.67	65
1.72	66
1.77	67
1.82	68
1.86	69
1.91	70
2.01	71
2.02	72
2.04	73
2.11	74
2.17	75
2.22	76
2.29	77
2.34	78
2.41	79
2.50	80
2.52	81
2.61	82
2.73	83
2.79	84
2.88	85
3.02	86
3.10	87
3.26	88
3.35	89
3.52	90
3.68	91
3.86	92
4.06	93
4.31	94
4.60	95
5.03	96
5.58	97
6.38	98
7.80	99
19.08	100