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A statistical analysis of the connection between test results and field claims for ECUs in vehicles
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematical Statistics.
2013 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The objective of this thesis is to analyse theconnection between test results and field claims of ECUs (electronic controlunits) at Scania in order to improve the acceptance criteria and evaluatesoftware testing strategies. The connection is examined through computation ofdifferent measures of dependencies such as the Pearson’s correlation, Spearman’srank correlation and Kendall’s tau. The correlations are computed from testresults in different ECU projects and considered in a predictive model based onlogistic regression. Numerical results indicate a weak connection between testresults and field claims. This is partly due to insufficient number of ECUprojects and the lack of traceability of field claims and test results. Themain conclusion confirms the present software testing strategy. Continuoussoftware release and testing results in a lower field claim and thus a betterproduct.

Place, publisher, year, edition, pages
2013. , 58 p.
TRITA-MAT-E, 2013:08
Keyword [en]
ECUs, Software testing, Pearsons’s correlation, Spearman’s rank correlation, Kendall’s tau, Logistic regression
National Category
Probability Theory and Statistics
URN: urn:nbn:se:kth:diva-118428OAI: diva2:610366
Subject / course
Mathematical Statistics
Educational program
Master of Science in Engineering -Engineering Physics
Physics, Chemistry, Mathematics
Available from: 2013-03-11 Created: 2013-02-18 Last updated: 2013-03-11Bibliographically approved

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