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
0.34	1
0.44	2
0.52	3
0.60	4
0.70	5
0.77	6
0.84	7
0.89	8
0.96	9
1.03	10
1.07	11
1.12	12
1.16	13
1.21	14
1.26	15
1.31	16
1.35	17
1.40	18
1.46	19
1.49	20
1.53	21
1.56	22
1.60	23
1.65	24
1.69	25
1.73	26
1.75	27
1.79	28
1.85	29
1.89	30
1.93	31
1.97	32
2.02	33
2.08	34
2.12	35
2.17	36
2.21	37
2.27	38
2.32	39
2.36	40
2.39	41
2.45	42
2.48	43
2.51	44
2.57	45
2.60	46
2.64	47
2.69	48
2.73	49
2.79	50
2.86	51
2.90	52
2.95	53
2.98	54
3.02	55
3.09	56
3.13	57
3.18	58
3.22	59
3.28	60
3.34	61
3.40	62
3.44	63
3.49	64
3.56	65
3.61	66
3.71	67
3.77	68
3.86	69
3.92	70
4.03	71
4.13	72
4.24	73
4.32	74
4.39	75
4.49	76
4.57	77
4.68	78
4.79	79
4.96	80
5.14	81
5.32	82
5.49	83
5.65	84
5.82	85
6.26	86
6.54	87
6.88	88
7.34	89
7.64	90
8.09	91
8.61	92
9.52	93
10.23	94
11.11	95
12.37	96
13.70	97
16.97	98
31.94	99
227.00	100