Document of bibliographic reference 242352

BibliographicReference record

Type

Bibliographic resource

Type of document

Reports

Type of document

Project report

BibLvlCode

MS

Title

Nautical bottom sediment research: Sub report 9. Statistical analysis

Abstract

In this sub report the available data from the measurements in the sediment test tank (STT) is analysed with the objective to find relationships between the different parameters that are measured in the STT. A first type of analysis carried out is a correlation research. This research shows if parameters are related and in what extent knowledge about one parameter gives insight into a different parameter. A second part of the report deals with regression analysis. The main objective of this kind of analysis is to find out how well one parameter (in this scope called a variable) can be predicted by knowledge of a different set of parameters (variables). Different regression approaches are used. A first is the stepwise regression analysis. This kind of analysis tries to find a linear relation between the dependent and independent variable in such a way that it includes only those variables that are significant for the regression equation. To optimise the results obtained by the stepwise regression analysis different pre-processing techniques have been applied to the data. A first is Cluster formation, which allows to subdivide the data set in different zones (clusters) and perform a regression analysis on the subset rather than the full dataset. This approach allows more accurate predictions in the clusters when comparing to the whole dataset. A second technique is that of the Box-Cox transformation which transforms variables in the dataset in such a way that it corresponds more with a linear relationship which, again, allows better prediction. A last part of the regression analysis is nonlinear data fitting, which allows more complex (nonlinear) relationships to be fitted in order to obtain an even higher accuracy. A last part of the research studies the dynamic yield stress and attempts to find correlations between the different characteristics of the shear curves..

Bibliographic citation

Wildemeersch, K.; Van Hoestenberghe, T.; Claeys, S.; De Schutter, J.; Vanlede, J.; Van Oyen, T.; Verwaest, T.; Mostaert, F. (2014). Nautical bottom sediment research: Sub report 9. Statistical analysis. Version 6.0. WL Rapporten, 00_161. Flanders Hydraulics Research: Antwerp. V, 66 + 3 p. bijl. pp.