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

1
0.75
0.5
0.25
0

Percentile

Measure	Percentile
0	0
0.00	1
0.01	2
0.01	3
0.01	4
0.01	5
0.01	6
0.02	7
0.02	8
0.02	9
0.02	10
0.02	11
0.03	12
0.03	13
0.03	14
0.03	15
0.03	16
0.04	17
0.04	18
0.04	19
0.04	20
0.04	21
0.04	22
0.05	23
0.05	24
0.05	25
0.05	26
0.05	27
0.06	28
0.06	29
0.06	30
0.06	31
0.06	32
0.07	33
0.07	34
0.07	35
0.07	36
0.07	37
0.08	38
0.08	39
0.08	40
0.08	41
0.09	42
0.09	43
0.09	44
0.09	45
0.10	46
0.10	47
0.10	48
0.10	49
0.10	50
0.11	51
0.11	52
0.11	53
0.11	54
0.12	55
0.12	56
0.12	57
0.13	58
0.13	59
0.13	60
0.14	61
0.14	62
0.14	63
0.15	64
0.15	65
0.15	66
0.16	67
0.16	68
0.16	69
0.17	70
0.17	71
0.18	72
0.18	73
0.19	74
0.19	75
0.19	76
0.20	77
0.20	78
0.21	79
0.22	80
0.22	81
0.23	82
0.24	83
0.25	84
0.26	85
0.27	86
0.27	87
0.28	88
0.30	89
0.31	90
0.32	91
0.34	92
0.36	93
0.38	94
0.42	95
0.47	96
0.54	97
0.67	98
1.46	99
5.29	100