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
0.50	3
0.60	4
0.70	5
0.81	6
0.91	7
1.03	8
1.13	9
1.22	10
1.34	11
1.43	12
1.54	13
1.64	14
1.73	15
1.82	16
1.94	17
2.03	18
2.12	19
2.22	20
2.31	21
2.41	22
2.51	23
2.61	24
2.70	25
2.80	26
2.89	27
3.02	28
3.10	29
3.20	30
3.30	31
3.40	32
3.51	33
3.60	34
3.70	35
3.81	36
3.90	37
4.02	38
4.13	39
4.23	40
4.34	41
4.45	42
4.57	43
4.68	44
4.80	45
4.90	46
5.02	47
5.13	48
5.25	49
5.37	50
5.47	51
5.61	52
5.73	53
5.85	54
6.01	55
6.11	56
6.23	57
6.39	58
6.52	59
6.67	60
6.82	61
7.00	62
7.11	63
7.26	64
7.40	65
7.56	66
7.72	67
7.88	68
8.04	69
8.21	70
8.39	71
8.57	72
8.76	73
8.95	74
9.15	75
9.36	76
9.58	77
9.79	78
10.03	79
10.26	80
10.50	81
10.76	82
11.03	83
11.33	84
11.62	85
12.00	86
12.31	87
12.68	88
13.08	89
13.51	90
13.94	91
14.45	92
15.03	93
15.67	94
16.43	95
17.27	96
18.36	97
19.77	98
22.04	99
30.00	100