GridClass-class         container for preprocessor combinations and
                        preprocessed data sets.
PreProCombClass-class   container for combination evaluation
PreprocessorClass-class
                        an abstract class from which concrete
                        preprocessor (sub) classes are inhereted.
exampleresult           preprocomb example
getpreprocessor         gets preprocessor definition
getprogrammaticprediction
                        parallel computation of classification accuracy
                        holdout rounds
initializedataclassobject
                        constructor function for creating a DataClass
                        object
prepro                  the MAIN function for interactive use.
preprocessordefinitionstorage
                        environment for storing preprocessor
                        definitions
preprocomb              the MAIN function of programmatic use.
preprodefault           seven default phases with preprocessing
                        techniques
setgrid                 constructor function for creating the
                        combinations
setphase                constructor function for defining a
                        preprocessing phase.
setpreprocessor         constructor function for adding a new
                        preprocessing technique to the system
showrules               shows association rules for classification
                        accuracy.
testpreprocessors       test preprocessing techniques against data
transformdata           transformdata
