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
0.03	1
0.04	2
0.04	3
0.05	4
0.05	5
0.05	6
0.06	7
0.07	8
0.08	9
0.10	10
0.11	11
0.13	12
0.15	13
0.17	14
0.18	15
0.20	16
0.22	17
0.24	18
0.25	19
0.27	20
0.28	21
0.29	22
0.30	23
0.31	24
0.32	25
0.34	26
0.35	27
0.36	28
0.37	29
0.38	30
0.39	31
0.40	32
0.41	33
0.42	34
0.44	35
0.45	36
0.46	37
0.47	38
0.48	39
0.50	40
0.51	41
0.53	42
0.54	43
0.56	44
0.57	45
0.59	46
0.60	47
0.62	48
0.63	49
0.65	50
0.67	51
0.69	52
0.70	53
0.72	54
0.74	55
0.76	56
0.77	57
0.80	58
0.82	59
0.84	60
0.86	61
0.88	62
0.90	63
0.92	64
0.95	65
0.97	66
1.01	67
1.02	68
1.04	69
1.07	70
1.10	71
1.12	72
1.16	73
1.19	74
1.22	75
1.25	76
1.29	77
1.32	78
1.36	79
1.41	80
1.44	81
1.50	82
1.53	83
1.58	84
1.64	85
1.71	86
1.77	87
1.84	88
1.91	89
2.01	90
2.10	91
2.23	92
2.38	93
2.52	94
2.76	95
3.04	96
3.42	97
4.00	98
4.96	99
12.20	100