com.rapidminer.operator.preprocessing.filter
Class NominalToNumeric

java.lang.Object
  com.rapidminer.operator.Operator
      com.rapidminer.operator.preprocessing.PreprocessingOperator
          com.rapidminer.operator.preprocessing.filter.NominalToNumeric

All Implemented Interfaces:

ConfigurationListener, PreviewListener, ParameterHandler, LoggingHandler

public class NominalToNumeric
extends PreprocessingOperator

This operator maps all non numeric attributes to real valued attributes. Nothing is done for numeric attributes, binary attributes are mapped to 0 and 1. For nominal attributes one of the following calculations will be done:

• Dichotomization, i.e. one new attribute for each value of the nominal attribute. The new attribute which corresponds to the actual nominal value gets value 1 and all other attributes gets value 0.
• Alternatively the values of nominal attributes can be seen as equally ranked, therefore the nominal attribute will simply be turned into a real valued attribute, the old values results in equidistant real values.

At this moment the same applies for ordinal attributes, in a future release more appropriate values based on the ranking between the ordinal values may be included.

Author:

Ingo Mierswa, Sebastian Land ingomierswa Exp $

Field Summary

Fields inherited from class com.rapidminer.operator.preprocessing.PreprocessingOperator

PARAMETER_CREATE_VIEW, PARAMETER_RETURN_PREPROCESSING_MODEL

Constructor Summary

NominalToNumeric(OperatorDescription description)

Method Summary

Model

createPreprocessingModel(ExampleSet exampleSet)

Methods inherited from class com.rapidminer.operator.preprocessing.PreprocessingOperator

apply, getInputClasses, getOutputClasses, getParameterTypes

Methods inherited from class com.rapidminer.operator.Operator

addError, addValue, addWarning, apply, checkDeprecations, checkForStop, checkIO, checkProperties, clearErrorList, cloneOperator, createExperimentTree, createExperimentTree, createFromXML, createMarkedExperimentTree, createMarkedProcessTree, createProcessTree, createProcessTree, getAddOnlyAdditionalOutput, getApplyCount, getDeliveredOutputClasses, getDeprecationInfo, getDesiredInputClasses, getEncoding, getErrorList, getExperiment, getInnerOperatorsXML, getInput, getInput, getInput, getInputDescription, getIOContainerForInApplyLoopBreakpoint, getIODescription, getLog, getName, getOperatorClassName, getOperatorDescription, getParameter, getParameterAsBoolean, getParameterAsColor, getParameterAsDouble, getParameterAsFile, getParameterAsFile, getParameterAsInputStream, getParameterAsInt, getParameterAsMatrix, getParameterAsString, getParameterList, getParameters, getParameterType, getParent, getProcess, getStartTime, getStatus, getUserDescription, getValue, getValues, getXML, hasBreakpoint, hasBreakpoint, hasInput, inApplyLoop, isDebugMode, isEnabled, isExpanded, isParallel, isParameterSet, log, logError, logNote, logWarning, performAdditionalChecks, processFinished, processStarts, register, registerOperator, remove, rename, resume, setApplyCount, setBreakpoint, setEnabled, setExpanded, setInput, setListParameter, setOperatorParameters, setParameter, setParameters, setParent, setUserDescription, toString, unregisterOperator, writeXML

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NominalToNumeric

public NominalToNumeric(OperatorDescription description)

Method Detail

createPreprocessingModel

public Model createPreprocessingModel(ExampleSet exampleSet)
                               throws OperatorException

Specified by:

createPreprocessingModel in class PreprocessingOperator

Throws:

OperatorException