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Issue No. 01 - January (2011 vol. 23)
ISSN: 1041-4347
pp: 110-121
Xiaofeng Zhu , University Technology Sydney, Sydney, Australia
Shichao Zhang , Zhejiang Normal University, Jinhua, China
Zhi Jin , Beijing University, Beijing, China
Zili Zhang , Southwest University Chongqing, China
Zhuoming Xu , Hohai University, Nanjing, China
Missing data imputation is a key issue in learning from incomplete data. Various techniques have been developed with great successes on dealing with missing values in data sets with homogeneous attributes (their independent attributes are all either continuous or discrete). This paper studies a new setting of missing data imputation, i.e., imputing missing data in data sets with heterogeneous attributes (their independent attributes are of different types), referred to as imputing mixed-attribute data sets. Although many real applications are in this setting, there is no estimator designed for imputing mixed-attribute data sets. This paper first proposes two consistent estimators for discrete and continuous missing target values, respectively. And then, a mixture-kernel-based iterative estimator is advocated to impute mixed-attribute data sets. The proposed method is evaluated with extensive experiments compared with some typical algorithms, and the result demonstrates that the proposed approach is better than these existing imputation methods in terms of classification accuracy and root mean square error (RMSE) at different missing ratios.
Classification, data mining, methodologies, machine learning.

Z. Xu, S. Zhang, X. Zhu, Z. Jin and Z. Zhang, "Missing Value Estimation for Mixed-Attribute Data Sets," in IEEE Transactions on Knowledge & Data Engineering, vol. 23, no. , pp. 110-121, 2010.
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