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How do I represent missing values in ARFF file format |
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Weka is a collection of machine learning algorithms for data mining tasks. The algorithms can either be applied directly to a dataset or called from your own Java code. Weka contains tools for data pre-processing, classification, regression, clustering, association rules, and visualization. It is also well-suited for developing new machine learning schemes.
Use "?" for missing attribute values. For more details see the page:
http://www.cs.waikato.ac.nz/~ml/weka/arff.html
Source: Weka FAQ
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