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
0.01	1
0.02	2
0.02	3
0.02	4
0.03	5
0.03	6
0.04	7
0.05	8
0.05	9
0.06	10
0.07	11
0.07	12
0.08	13
0.09	14
0.09	15
0.10	16
0.10	17
0.11	18
0.11	19
0.12	20
0.13	21
0.13	22
0.14	23
0.14	24
0.15	25
0.15	26
0.16	27
0.16	28
0.17	29
0.18	30
0.18	31
0.19	32
0.19	33
0.20	34
0.20	35
0.21	36
0.22	37
0.22	38
0.23	39
0.23	40
0.24	41
0.25	42
0.25	43
0.26	44
0.27	45
0.27	46
0.28	47
0.29	48
0.30	49
0.31	50
0.31	51
0.32	52
0.33	53
0.34	54
0.35	55
0.35	56
0.36	57
0.38	58
0.38	59
0.39	60
0.41	61
0.42	62
0.43	63
0.44	64
0.45	65
0.46	66
0.47	67
0.49	68
0.50	69
0.51	70
0.53	71
0.54	72
0.56	73
0.57	74
0.59	75
0.61	76
0.63	77
0.65	78
0.67	79
0.69	80
0.71	81
0.74	82
0.77	83
0.79	84
0.82	85
0.86	86
0.89	87
0.93	88
0.98	89
1.04	90
1.09	91
1.17	92
1.25	93
1.34	94
1.46	95
1.59	96
1.83	97
2.12	98
2.92	99
13.84	100