# Package weka.filters.unsupervised.attribute

package weka.filters.unsupervised.attribute

- Class
  Description
  AbstractTimeSeries
  An abstract instance filter that assumes instances form time-series data and performs some merging of attribute values in the current instance with attribute attribute values of some previous (or future) instance.
  Add
  An instance filter that adds a new attribute to the dataset.
  AddCluster
  A filter that adds a new nominal attribute representing the cluster assigned to each instance by the specified clustering algorithm.
  Either the clustering algorithm gets built with the first batch of data or one specifies are serialized clusterer model file to use instead.
  AddExpression
  An instance filter that creates a new attribute by applying a mathematical expression to existing attributes.
  AddID
  An instance filter that adds an ID attribute to the dataset.
  AddNoise
  An instance filter that changes a percentage of a given attribute's values.
  AddUserFields
  A filter that adds new attributes with user specified type and constant value.
  AddUserFields.AttributeSpec
  Inner class encapsulating a new user-specified attribute to create.
  AddUserFieldsBeanInfo
  Bean info class for the AddUserFields filter.
  AddValues
  Adds the labels from the given list to an attribute if they are missing.
  CartesianProduct
  A filter for performing the Cartesian product of a set of nominal attributes.
  Center
  Centers all numeric attributes in the given dataset to have zero mean (apart from the class attribute, if set).
  ChangeDateFormat
  Changes the date format used by a date attribute.
  ClassAssigner
  Filter that can set and unset the class index.
  ClusterMembership
  A filter that uses a density-based clusterer to generate cluster membership values; filtered instances are composed of these values plus the class attribute (if set in the input data).
  Copy
  An instance filter that copies a range of attributes in the dataset.
  DateToNumeric
  A filter for turning date attributes into numeric ones.
  Discretize
  An instance filter that discretizes a range of numeric attributes in the dataset into nominal attributes.
  FirstOrder
  This instance filter takes a range of N numeric attributes and replaces them with N-1 numeric attributes, the values of which are the difference between consecutive attribute values from the original instance.
  FixedDictionaryStringToWordVector
  Converts String attributes into a set of attributes representing word occurrence (depending on the tokenizer) information from the text contained in the strings.
  InterquartileRange
  A filter for detecting outliers and extreme values based on interquartile ranges.
  InterquartileRange.ValueType
  enum for obtaining the various determined IQR values.
  KernelFilter
  Converts the given set of data into a kernel matrix.
  MakeIndicator
  A filter that creates a new dataset with a Boolean attribute replacing a nominal attribute.
  MathExpression
  Modify numeric attributes according to a given mathematical expression.
  MergeInfrequentNominalValues
  Merges all values of the specified nominal attributes that are insufficiently frequent.
  MergeManyValues
  Merges many values of a nominal attribute into one value.
  MergeTwoValues
  Merges two values of a nominal attribute into one value.
  NominalToBinary
  Converts all nominal attributes into binary numeric attributes.
  NominalToString
  Converts a nominal attribute (i.e.
  Normalize
  Normalizes all numeric values in the given dataset (apart from the class attribute, if set).
  NumericCleaner
  A filter that 'cleanses' the numeric data from values that are too small, too big or very close to a certain value, and sets these values to a pre-defined default.
  NumericToBinary
  Converts all numeric attributes into binary attributes (apart from the class attribute, if set): if the value of the numeric attribute is exactly zero, the value of the new attribute will be zero.
  NumericToDate
  A filter for turning numeric attributes into date attributes.
  NumericToNominal
  A filter for turning numeric attributes into nominal ones.
  NumericTransform
  Transforms numeric attributes using a given transformation method.
  Obfuscate
  A simple instance filter that renames the relation, all attribute names and all nominal attribute values.
  OrdinalToNumeric
  An attribute filter that converts ordinal nominal attributes into numeric ones
  Valid options are:
  PartitionedMultiFilter
  A filter that applies filters on subsets of attributes and assembles the output into a new dataset.
  PKIDiscretize
  Discretizes numeric attributes using equal frequency binning and forces the number of bins to be equal to the square root of the number of values of the numeric attribute.
  For more information, see:
  Ying Yang, Geoffrey I.
  PotentialClassIgnorer
  This filter should be extended by other unsupervised attribute filters to allow processing of the class attribute if that's required.
  PrincipalComponents
  Performs a principal components analysis and transformation of the data.
  Dimensionality reduction is accomplished by choosing enough eigenvectors to account for some percentage of the variance in the original data -- default 0.95 (95%).
  Based on code of the attribute selection scheme 'PrincipalComponents' by Mark Hall and Gabi Schmidberger.
  RandomProjection
  Reduces the dimensionality of the data by projecting it onto a lower dimensional subspace using a random matrix with columns of unit length.
  RandomSubset
  Chooses a random subset of non-class attributes, either an absolute number or a percentage.
  Remove
  An filter that removes a range of attributes from the dataset.
  RemoveByName
  Removes attributes based on a regular expression matched against their names.
  RemoveType
  Removes attributes of a given type.
  RemoveUseless
  This filter removes attributes that do not vary at all or that vary too much.
  RenameAttribute
  This filter is used for renaming attributes.
  Regular expressions can be used in the matching and replacing.
  See Javadoc of java.util.regex.Pattern class for more information:
  http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html
  RenameNominalValues
  Renames the values of nominal attributes.
  Reorder
  A filter that generates output with a new order of the attributes.
  ReplaceMissingValues
  Replaces all missing values for nominal and numeric attributes in a dataset with the modes and means from the training data.
  ReplaceMissingWithUserConstant
  Replaces all missing values for nominal, string, numeric and date attributes in the dataset with user-supplied constant values.
  ReplaceWithMissingValue
  A filter that can be used to introduce missing values in a dataset.
  SortLabels
  A simple filter for sorting the labels of nominal attributes.
  SortLabels.CaseInsensitiveComparator
  Represents a case-insensitive comparator for two strings.
  SortLabels.CaseSensitiveComparator
  Represents a case-sensitive comparator for two strings.
  Standardize
  Standardizes all numeric attributes in the given dataset to have zero mean and unit variance (apart from the class attribute, if set).
  StringToNominal
  Converts a range of string attributes (unspecified number of values) to nominal (set number of values).
  StringToWordVector
  Converts string attributes into a set of numeric attributes representing word occurrence information from the text contained in the strings.
  SwapValues
  Swaps two values of a nominal attribute.
  TimeSeriesDelta
  An instance filter that assumes instances form time-series data and replaces attribute values in the current instance with the difference between the current value and the equivalent attribute attribute value of some previous (or future) instance.
  TimeSeriesTranslate
  An instance filter that assumes instances form time-series data and replaces attribute values in the current instance with the equivalent attribute values of some previous (or future) instance.
  Transpose
  Transposes the data: instances become attributes and attributes become instances.