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
0.02	8
0.03	9
0.03	10
0.03	11
0.03	12
0.03	13
0.04	14
0.04	15
0.04	16
0.04	17
0.04	18
0.05	19
0.05	20
0.05	21
0.05	22
0.05	23
0.06	24
0.06	25
0.06	26
0.06	27
0.06	28
0.07	29
0.07	30
0.07	31
0.08	32
0.08	33
0.08	34
0.08	35
0.08	36
0.09	37
0.09	38
0.09	39
0.09	40
0.10	41
0.10	42
0.10	43
0.10	44
0.11	45
0.11	46
0.11	47
0.12	48
0.12	49
0.12	50
0.12	51
0.13	52
0.13	53
0.13	54
0.14	55
0.14	56
0.14	57
0.15	58
0.15	59
0.15	60
0.16	61
0.16	62
0.16	63
0.17	64
0.17	65
0.18	66
0.18	67
0.19	68
0.19	69
0.20	70
0.20	71
0.21	72
0.21	73
0.22	74
0.22	75
0.23	76
0.23	77
0.24	78
0.25	79
0.26	80
0.26	81
0.27	82
0.28	83
0.29	84
0.31	85
0.32	86
0.33	87
0.35	88
0.37	89
0.38	90
0.40	91
0.43	92
0.47	93
0.50	94
0.55	95
0.63	96
0.74	97
0.90	98
1.41	99
5.14	100