| Package | Description |
|---|---|
| weka.filters.supervised.attribute | |
| weka.filters.unsupervised.attribute | |
| weka.filters.unsupervised.instance |
| Modifier and Type | Class and Description |
|---|---|
class |
AddClassification
A filter for adding the classification, the class
distribution and an error flag to a dataset with a classifier.
|
class |
MergeNominalValues
Merges values of all nominal attributes among the
specified attributes, excluding the class attribute, using the CHAID method,
but without considering to re-split merged subsets.
|
| Modifier and Type | Class and Description |
|---|---|
class |
InterquartileRange
A filter for detecting outliers and extreme values
based on interquartile ranges.
|
class |
KernelFilter
Converts the given set of predictor variables into
a kernel matrix.
|
class |
MergeInfrequentNominalValues
Merges all values of the specified nominal
attribute that are sufficiently infrequent.
|
class |
NumericToNominal
A filter for turning numeric attributes into
nominal ones.
|
class |
PartitionedMultiFilter
A filter that applies filters on subsets of
attributes and assembles the output into a new dataset.
|
class |
Transpose
Transposes the data: instances become attributes and attributes become instances.
|
| Modifier and Type | Class and Description |
|---|---|
class |
RemoveDuplicates
Removes all duplicate instances from the first batch of data it receives.
|
class |
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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