An approach for classification of highly imbalanced data using weighting and undersampling

Ashish Anand, Ganesan Pugalenthi, Gary B. Fogel, P. N. Suganthan

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


Real-world datasets commonly have issues with data imbalance. There are several approaches such as weighting, sub-sampling, and data modeling for handling these data. Learning in the presence of data imbalances presents a great challenge to machine learning. Techniques such as support-vector machines have excellent performance for balanced data, but may fail when applied to imbalanced datasets. In this paper, we propose a new undersampling technique for selecting instances from the majority class. The performance of this approach was evaluated in the context of several real biological imbalanced data. The ratios of negative to positive samples vary from ~9:1 to ~100:1. Useful classifiers have high sensitivity and specificity. Our results demonstrate that the proposed selection technique improves the sensitivity compared to weighted support-vector machine and available results in the literature for the same datasets.

Original languageEnglish (US)
Pages (from-to)1385-1391
Number of pages7
JournalAmino Acids
Issue number5
StatePublished - Nov 2010
Externally publishedYes


  • Imbalanced datasets
  • SVM
  • Undersampling technique

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Organic Chemistry


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