Abstract
Tackling missing data is one of the fundamental data pre-processing steps. Data analysis and pattern extraction are affected due to the underlying differences between instances with and without missing data. This is a particular problem with ordinal data, where for example a sample of a population may have all failed to answer a specific question in a questionnaire. The existing methods such as listwise deletion, mean attribute substitution, and regression substitution, naively impute data. They do not impute plausible values as they fail to take into account the relationships between the attributes, but instead consider the distribution of the attribute with missing values only. In this paper we introduce the use of Classification Based Imputation (CNI) to replace missing values with plausible values in ordinal data. The results show that not only does the CNI based technique outperform the existing approaches for imputing missing values in ordinal data but it also helps to improve the classification accuracy of machine learning algorithms.
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Alam, S., Dobbie, G., Sun, X. (2017). Improving Imputation Accuracy in Ordinal Data Using Classification. In: Madureira, A., Abraham, A., Gamboa, D., Novais, P. (eds) Intelligent Systems Design and Applications. ISDA 2016. Advances in Intelligent Systems and Computing, vol 557. Springer, Cham. https://doi.org/10.1007/978-3-319-53480-0_5
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DOI: https://doi.org/10.1007/978-3-319-53480-0_5
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