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
0.08	1
0.10	2
0.11	3
0.13	4
0.15	5
0.16	6
0.17	7
0.19	8
0.21	9
0.22	10
0.24	11
0.26	12
0.27	13
0.29	14
0.31	15
0.34	16
0.34	17
0.38	18
0.40	19
0.43	20
0.45	21
0.50	22
0.52	23
0.54	24
0.59	25
0.62	26
0.65	27
0.69	28
0.72	29
0.76	30
0.80	31
0.84	32
0.88	33
0.90	34
1.00	35
1.01	36
1.03	37
1.07	38
1.12	39
1.17	40
1.17	41
1.23	42
1.27	43
1.31	44
1.38	45
1.40	46
1.41	47
1.50	48
1.52	49
1.58	50
1.62	51
1.68	52
1.75	53
1.76	54
1.77	55
1.84	56
1.91	57
2.00	58
2.02	59
2.03	60
2.11	61
2.19	62
2.26	63
2.34	64
2.34	65
2.35	66
2.43	67
2.52	68
2.63	69
2.67	70
2.75	71
2.81	72
2.91	73
3.01	74
3.03	75
3.15	76
3.26	77
3.38	78
3.50	79
3.53	80
3.69	81
3.84	82
4.01	83
4.13	84
4.26	85
4.43	86
4.64	87
4.76	88
5.01	89
5.22	90
5.41	91
5.68	92
6.02	93
6.38	94
6.88	95
7.26	96
7.90	97
9.00	98
10.60	99
27.71	100