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
0.07	1
0.08	2
0.09	3
0.11	4
0.13	5
0.15	6
0.17	7
0.18	8
0.21	9
0.23	10
0.26	11
0.28	12
0.30	13
0.33	14
0.35	15
0.38	16
0.40	17
0.43	18
0.43	19
0.46	20
0.50	21
0.51	22
0.53	23
0.55	24
0.57	25
0.60	26
0.61	27
0.63	28
0.65	29
0.67	30
0.68	31
0.71	32
0.72	33
0.76	34
0.77	35
0.79	36
0.82	37
0.84	38
0.86	39
0.89	40
0.91	41
0.92	42
1.00	43
1.01	44
1.02	45
1.03	46
1.07	47
1.10	48
1.12	49
1.14	50
1.18	51
1.21	52
1.25	53
1.26	54
1.30	55
1.34	56
1.38	57
1.43	58
1.43	59
1.50	60
1.51	61
1.56	62
1.60	63
1.65	64
1.67	65
1.70	66
1.77	67
1.81	68
1.85	69
1.88	70
2.00	71
2.02	72
2.03	73
2.10	74
2.15	75
2.21	76
2.26	77
2.31	78
2.40	79
2.50	80
2.53	81
2.61	82
2.73	83
2.81	84
2.90	85
3.02	86
3.09	87
3.26	88
3.35	89
3.53	90
3.68	91
3.88	92
4.08	93
4.37	94
4.73	95
5.12	96
5.67	97
6.50	98
7.97	99
19.00	100