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
0.00	1
0.01	2
0.01	3
0.01	4
0.02	5
0.02	6
0.02	7
0.03	8
0.03	9
0.03	10
0.03	11
0.04	12
0.04	13
0.04	14
0.05	15
0.05	16
0.05	17
0.05	18
0.05	19
0.06	20
0.06	21
0.06	22
0.06	23
0.06	24
0.07	25
0.07	26
0.07	27
0.08	28
0.08	29
0.08	30
0.08	31
0.09	32
0.09	33
0.09	34
0.10	35
0.10	36
0.10	37
0.10	38
0.11	39
0.11	40
0.11	41
0.11	42
0.12	43
0.12	44
0.12	45
0.12	46
0.13	47
0.13	48
0.13	49
0.14	50
0.14	51
0.14	52
0.15	53
0.15	54
0.15	55
0.15	56
0.16	57
0.16	58
0.17	59
0.17	60
0.17	61
0.17	62
0.18	63
0.18	64
0.19	65
0.19	66
0.20	67
0.20	68
0.20	69
0.21	70
0.21	71
0.22	72
0.23	73
0.23	74
0.24	75
0.25	76
0.26	77
0.27	78
0.28	79
0.29	80
0.30	81
0.31	82
0.32	83
0.33	84
0.35	85
0.38	86
0.40	87
0.43	88
0.46	89
0.50	90
0.54	91
0.59	92
0.64	93
0.71	94
0.82	95
0.98	96
1.06	97
1.48	98
2.39	99
3.01	100