Missing-values adjustment for mixed-type data.

*(English)*Zbl 1229.62039Summary: We propose a new method of single imputation, reconstruction, and estimation of nonreported, incorrect, implausible, or excluded values in more than one field of the record. In particular, we will be concerned with data sets involving a mixture of numeric, ordinal, binary, and categorical variables. Our technique is a variation of the popular nearest neighbor hot deck imputation (NNHDI) where “nearest” is defined in terms of a global distance obtained as a convex combination of the distance matrices computed for the various types of variables. We address the problem of proper weighting of the partial distance matrices in order to reflect their significance, reliability, and statistical adequacy. Performance of several weighting schemes is compared under a variety of settings in coordination with imputation of the least power mean of the Box-Cox transformation applied to the values of the donors. Through analysis of simulated and actual data sets, we will show that this approach is appropriate. Our main contribution has been to demonstrate that mixed data may optimally be combined to allow the accurate reconstruction of missing values in the target variable even when some data are absent from the other fields of the record.

##### MSC:

62G05 | Nonparametric estimation |

65C60 | Computational problems in statistics (MSC2010) |

62H99 | Multivariate analysis |

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\textit{A. Tarsitano} and \textit{M. Falcone}, J. Probab. Stat. 2011, Article ID 290380, 20 p. (2011; Zbl 1229.62039)

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