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
1.21	10
1.31	11
1.40	12
1.51	13
1.60	14
1.69	15
1.78	16
1.88	17
2.02	18
2.09	19
2.19	20
2.29	21
2.40	22
2.50	23
2.58	24
2.68	25
2.77	26
2.86	27
3.01	28
3.08	29
3.17	30
3.27	31
3.36	32
3.47	33
3.58	34
3.68	35
3.79	36
3.88	37
4.01	38
4.09	39
4.20	40
4.31	41
4.41	42
4.52	43
4.63	44
4.75	45
4.86	46
5.01	47
5.09	48
5.22	49
5.34	50
5.46	51
5.60	52
5.72	53
5.84	54
6.01	55
6.09	56
6.22	57
6.36	58
6.51	59
6.63	60
6.78	61
6.93	62
7.08	63
7.23	64
7.38	65
7.54	66
7.69	67
7.86	68
8.03	69
8.19	70
8.36	71
8.52	72
8.71	73
8.91	74
9.12	75
9.34	76
9.56	77
9.79	78
10.03	79
10.23	80
10.47	81
10.73	82
11.01	83
11.27	84
11.57	85
11.89	86
12.25	87
12.61	88
13.03	89
13.45	90
13.92	91
14.43	92
15.04	93
15.67	94
16.40	95
17.23	96
18.29	97
19.82	98
22.03	99
30.00	100