Partitioning into training and test set: A regression dataset is split into a training and a test set which is performed by the Split Dataset Into Train-/Testset. Then a regression model is created by the Weka Regression worker and evaluated by the Evaluate Regression Results as PDF which stores the results in a PDF file. The dataset is read from a XRFF file (IN XRFF). The generated test and training sets are coded as XRFF files and stored on hard disk. The OUT input port determines the result output folder.