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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. 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