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
0.37	2
0.47	3
0.58	4
0.68	5
0.80	6
0.89	7
1.03	8
1.12	9
1.21	10
1.34	11
1.41	12
1.52	13
1.61	14
1.71	15
1.80	16
1.90	17
2.02	18
2.10	19
2.20	20
2.29	21
2.40	22
2.50	23
2.58	24
2.68	25
2.77	26
2.88	27
3.01	28
3.08	29
3.18	30
3.28	31
3.38	32
3.50	33
3.58	34
3.68	35
3.78	36
3.88	37
4.01	38
4.09	39
4.20	40
4.31	41
4.43	42
4.55	43
4.67	44
4.78	45
4.89	46
5.02	47
5.13	48
5.24	49
5.35	50
5.47	51
5.60	52
5.72	53
5.86	54
6.01	55
6.11	56
6.23	57
6.37	58
6.52	59
6.67	60
6.80	61
6.94	62
7.10	63
7.23	64
7.39	65
7.56	66
7.72	67
7.88	68
8.03	69
8.21	70
8.38	71
8.57	72
8.75	73
8.93	74
9.13	75
9.35	76
9.56	77
9.80	78
10.03	79
10.26	80
10.51	81
10.75	82
11.03	83
11.31	84
11.62	85
11.94	86
12.29	87
12.67	88
13.04	89
13.51	90
14.00	91
14.45	92
15.04	93
15.67	94
16.44	95
17.29	96
18.36	97
19.85	98
22.04	99
30.00	100