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
0.03	7
0.03	8
0.03	9
0.03	10
0.04	11
0.04	12
0.05	13
0.05	14
0.05	15
0.06	16
0.06	17
0.07	18
0.07	19
0.08	20
0.08	21
0.09	22
0.09	23
0.10	24
0.10	25
0.11	26
0.11	27
0.12	28
0.12	29
0.13	30
0.13	31
0.14	32
0.14	33
0.15	34
0.15	35
0.16	36
0.17	37
0.17	38
0.18	39
0.18	40
0.19	41
0.20	42
0.20	43
0.21	44
0.22	45
0.23	46
0.23	47
0.24	48
0.24	49
0.25	50
0.26	51
0.26	52
0.27	53
0.28	54
0.28	55
0.29	56
0.30	57
0.31	58
0.32	59
0.33	60
0.33	61
0.35	62
0.36	63
0.37	64
0.38	65
0.39	66
0.40	67
0.41	68
0.43	69
0.44	70
0.46	71
0.47	72
0.49	73
0.50	74
0.52	75
0.54	76
0.56	77
0.58	78
0.60	79
0.62	80
0.64	81
0.67	82
0.70	83
0.74	84
0.77	85
0.81	86
0.84	87
0.88	88
0.92	89
0.97	90
1.03	91
1.10	92
1.18	93
1.27	94
1.35	95
1.49	96
1.65	97
1.94	98
2.41	99
6.32	100