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
0.02	6
0.02	7
0.02	8
0.02	9
0.02	10
0.02	11
0.02	12
0.03	13
0.03	14
0.03	15
0.03	16
0.03	17
0.03	18
0.03	19
0.03	20
0.03	21
0.03	22
0.04	23
0.04	24
0.04	25
0.04	26
0.04	27
0.04	28
0.04	29
0.04	30
0.04	31
0.04	32
0.05	33
0.05	34
0.05	35
0.05	36
0.05	37
0.05	38
0.05	39
0.05	40
0.05	41
0.06	42
0.06	43
0.06	44
0.06	45
0.06	46
0.06	47
0.06	48
0.06	49
0.06	50
0.07	51
0.07	52
0.07	53
0.07	54
0.07	55
0.07	56
0.08	57
0.08	58
0.08	59
0.08	60
0.08	61
0.08	62
0.08	63
0.09	64
0.09	65
0.09	66
0.09	67
0.10	68
0.10	69
0.10	70
0.10	71
0.10	72
0.11	73
0.11	74
0.11	75
0.12	76
0.12	77
0.13	78
0.13	79
0.13	80
0.14	81
0.15	82
0.15	83
0.16	84
0.16	85
0.17	86
0.18	87
0.19	88
0.19	89
0.21	90
0.22	91
0.24	92
0.26	93
0.28	94
0.33	95
0.40	96
0.53	97
0.77	98
2.20	99
2.87	100