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
0.23	1
0.36	2
0.47	3
0.58	4
0.68	5
0.80	6
0.89	7
1.02	8
1.11	9
1.20	10
1.30	11
1.40	12
1.50	13
1.60	14
1.68	15
1.78	16
1.88	17
2.01	18
2.08	19
2.19	20
2.28	21
2.38	22
2.47	23
2.56	24
2.67	25
2.76	26
2.86	27
2.95	28
3.04	29
3.15	30
3.25	31
3.34	32
3.45	33
3.56	34
3.67	35
3.77	36
3.87	37
4.01	38
4.09	39
4.20	40
4.30	41
4.40	42
4.52	43
4.63	44
4.75	45
4.86	46
5.01	47
5.09	48
5.21	49
5.34	50
5.45	51
5.58	52
5.69	53
5.82	54
6.00	55
6.08	56
6.21	57
6.34	58
6.50	59
6.61	60
6.76	61
6.91	62
7.07	63
7.21	64
7.36	65
7.52	66
7.68	67
7.84	68
8.02	69
8.18	70
8.36	71
8.55	72
8.73	73
8.91	74
9.12	75
9.34	76
9.56	77
9.80	78
10.03	79
10.23	80
10.50	81
10.72	82
11.02	83
11.29	84
11.59	85
11.92	86
12.26	87
12.63	88
13.04	89
13.45	90
13.92	91
14.44	92
15.03	93
15.72	94
16.45	95
17.26	96
18.31	97
19.82	98
22.13	99
30.00	100