Functional Analysis of Real World Truck Fuel Consumption Data

• Main Author: Vogetseder, Georg
• Format: Others
• Language: English
• Published: Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE) 2008
• Subjects: PCA; Clustering; Sparse data
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1148

This thesis covers the analysis of sparse and irregular fuel consumption data of long distance haulage articulate trucks. It is shown that this kind of data is hard to analyse with multivariate as well as with functional methods. To be able to analyse the data, Principal Components Analysis through Conditional Expectation (PACE) is used, which enables the use of observations from many trucks to compensate for the sparsity of observations in order to get continuous results. The principal component scores generated by PACE, can then be used to get rough estimates of the trajectories for single trucks as well as to detect outliers. The data centric approach of PACE is very useful to enable functional analysis of sparse and irregular data. Functional analysis is desirable for this data to sidestep feature extraction and enabling a more natural view on the data.