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## Package weka.filters.unsupervised.instance

Class Summary
NonSparseToSparse | An instance filter that converts all incoming instances into sparse format.
Normalize | An instance filter that normalize instances considering only numeric attributes and ignoring class index.
Randomize | Randomly shuffles the order of instances passed through it.
RemoveFolds | This filter takes a dataset and outputs a specified fold for cross validation.
RemoveFrequentValues | Determines which values (frequent or infrequent ones) of an (nominal) attribute are retained and filters the instances accordingly.
RemoveMisclassified | A filter that removes instances which are incorrectly classified.
RemovePercentage | A filter that removes a given percentage of a dataset.
RemoveRange | A filter that removes a given range of instances of a dataset.
RemoveWithValues | Filters instances according to the value of an attribute.
Resample | Produces a random subsample of a dataset using either sampling with replacement or without replacement.
ReservoirSample | Produces a random subsample of a dataset using the reservoir sampling Algorithm "R" by Vitter.
SparseToNonSparse | An instance filter that converts all incoming sparse instances into non-sparse format.
SubsetByExpression | Filters instances according to a user-specified expression. Grammar: boolexpr_list ::= boolexpr_list boolexpr_part | boolexpr_part; boolexpr_part ::= boolexpr:e {: parser.setResult(e); :} ; boolexpr ::= BOOLEAN | true | false | expr < expr | expr <= expr | expr > expr | expr >= expr | expr = expr | ( boolexpr ) | not boolexpr | boolexpr and boolexpr | boolexpr or boolexpr | ATTRIBUTE is STRING ; expr ::= NUMBER | ATTRIBUTE | ( expr ) | opexpr | funcexpr ; opexpr ::= expr + expr | expr - expr | expr * expr | expr / expr ; funcexpr ::= abs ( expr ) | sqrt ( expr ) | log ( expr ) | exp ( expr ) | sin ( expr ) | cos ( expr ) | tan ( expr ) | rint ( expr ) | floor ( expr ) | pow ( expr for base , expr for exponent ) | ceil ( expr ) ; Notes: - NUMBER any integer or floating point number (but not in scientific notation!) - STRING any string surrounded by single quotes; the string may not contain a single quote though. - ATTRIBUTE the following placeholders are recognized for attribute values: - CLASS for the class value in case a class attribute is set. - ATTxyz with xyz a number from 1 to # of attributes in the dataset, representing the value of indexed attribute. Examples: - extracting only mammals and birds from the 'zoo' UCI dataset: (CLASS is 'mammal') or (CLASS is 'bird') - extracting only animals with at least 2 legs from the 'zoo' UCI dataset: (ATT14 >= 2) - extracting only instances with non-missing 'wage-increase-second-year' from the 'labor' UCI dataset: not ismissing(ATT3) Valid options are:

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