A Measure of the Information Loss for Inspection Point Reduction
Artikel i vetenskaplig tidskrift, 2009

Since the vehicle program in the automotive industry gets more and more extensive, the costs related to inspection increase. Therefore, there are needs for more effective inspection preparation. In many situations, a large number of inspection points are measured, despite the fact that only a small subset of points is needed. A method, based on cluster analysis, for identifying redundant inspection points has earlier been successfully tested on industrial cases. Cluster analysis is used for grouping the variables into clusters, where the points in each cluster are highly correlated. From every cluster only one representing point is selected for inspection. In this paper the method is further developed, and multiple linear regression is used for evaluating how much of the information is lost when discarding an inspection point. The information loss can be quantified using an efficiency measure based on linear multiple regression, where the part of the variation in the discarded variables that can be explained by the remaining variables is calculated. This measure can be illustrated graphically and that helps to decide how many clusters that should be formed, i.e., how many inspection points that can be discarded.

regression

variable reduction

information loss

cluster analysis

inspection

Författare

Kristina Wärmefjord

Chalmers, Produkt- och produktionsutveckling, Produktutveckling

Johan Carlson

Stiftelsen Fraunhofer-Chalmers Centrum för Industrimatematik

Rikard Söderberg

Chalmers, Produkt- och produktionsutveckling, Produktutveckling

Journal of Manufacturing Science and Engineering, Transactions of the ASME

1087-1357 (ISSN)

Vol. 131 0510171-0510176

Ämneskategorier

Produktionsteknik, arbetsvetenskap och ergonomi

Sannolikhetsteori och statistik

DOI

10.1115/1.4000105