Preview

Dependability

Advanced search

ASSESSMENT OF NATIONAL REFERENCE VALUES FOR RAILWAY SAFETY A STATISTICAL TREATMENT

https://doi.org/10.21683/1729-2646-2013-0-2-108-125

Abstract

We discuss the decision procedure used in the Commission Decision [1] for national reference values (NRV). According to the safety directive, every year seven safety indicators have to be computed for every member state. In the decision a fixed procedure has been presented for computing the safety indicators and to assess whether there is a possible deterioration in safety. In the safety assessment, the decision depends on a weighted sum in place of an arithmetic mean.

It is then of interest how such a decision procedure would behave and what would be the advantages and disadvantages of the particular method. In this paper, we study a slightly simplified version of the procedure by two means. First, we analyse the weighted sum and derives its characteristic as efficiency. Moreover, we compare it via a spread with an ordinary sample mean. We support the theoretical results with the help of a simple simulation study in order to estimate failure probabilities of the first and second kinds. In particular, we construct bad alternative distributions which the decision procedure cannot distinguish.

About the Authors

J. Braband
Siemens AG
Germany
Professor, Industry Sector, Mobility Division


H. Schebe
TUV Rheinland InterTraffic
Germany
Doctor of Physics and Mathematics, Head of Risk and Hazard Analysis Division, Cologne


References

1. Commission Decision of 5 June 2009 on the adaption of a common safety method for assessment of achievement of safety targets, as referred to in Article 6 of Directive 2004/49/EC of the European Parliament and the Council; 2009/460/EC.

2. F.R. Hampel, E.M. Ronchetti, P.J. Rosseeuw, W.A.Stahel, Robust Statistics – The Approach based on Influence Functions,. Wiley 1986.

3. J.W. Tukey, Exploratory Data Analysis, Addison Wesley 1977.

4. Directive 2004/49/EC of the European Parliament and of the Council of 29 April 2004 on safety on the Community’s railways.

5. A.J. Duncan, Quality Control and Industrial Statistics, Homewood / Illinois 1965.

6. J. Braband, H. Schäbe, The collective risk, the individual risk and their dependence on exposition time, ESREL 2011, Proceedings , Advances in Safety, Reliability and Risk Management, pp. 1783-1787).


Review

For citations:


Braband J., Schebe H. ASSESSMENT OF NATIONAL REFERENCE VALUES FOR RAILWAY SAFETY A STATISTICAL TREATMENT. Dependability. 2013;(2):108-125. https://doi.org/10.21683/1729-2646-2013-0-2-108-125

Views: 777


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


ISSN 1729-2646 (Print)
ISSN 2500-3909 (Online)