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
0.06	1
0.07	2
0.08	3
0.09	4
0.09	5
0.10	6
0.11	7
0.11	8
0.13	9
0.13	10
0.14	11
0.15	12
0.15	13
0.17	14
0.17	15
0.18	16
0.20	17
0.21	18
0.22	19
0.23	20
0.25	21
0.26	22
0.27	23
0.29	24
0.31	25
0.34	26
0.36	27
0.38	28
0.41	29
0.44	30
0.47	31
0.51	32
0.53	33
0.57	34
0.59	35
0.63	36
0.65	37
0.68	38
0.71	39
0.72	40
0.76	41
0.77	42
0.81	43
0.84	44
0.85	45
0.89	46
0.91	47
0.93	48
1.01	49
1.02	50
1.03	51
1.08	52
1.11	53
1.12	54
1.16	55
1.21	56
1.25	57
1.26	58
1.30	59
1.34	60
1.38	61
1.43	62
1.43	63
1.47	64
1.54	65
1.57	66
1.62	67
1.67	68
1.68	69
1.75	70
1.81	71
1.84	72
1.88	73
2.00	74
2.02	75
2.03	76
2.10	77
2.17	78
2.22	79
2.30	80
2.34	81
2.45	82
2.51	83
2.57	84
2.70	85
2.75	86
2.86	87
3.01	88
3.09	89
3.28	90
3.35	91
3.56	92
3.76	93
4.01	94
4.29	95
4.61	96
5.08	97
5.76	98
7.02	99
15.44	100