Description Details Author(s) References
Two methods based on the Forward Imputation (ForImp) approach are implemented for the imputation of quantitative missing data. One method alternates the Nearest Neighbour Imputation (NNI) method and Principal Component Analysis (function ForImp.PCA
), the other uses NNI with the Mahalanobis distance (function ForImp.Mahala
).
ForImp is a sequential distance-based approach that performs imputation of missing data in a forward, step-by-step process involving subsets of units according to their “completeness rate”. During the iterative process, the complete part of data is updated thus becoming larger and larger. No initialization of missing entries is required.
ForImp is inherent in the nonparametric and exploratory-descriptive framework since it does not require a priori distribution assumptions on data.
Two supplementary functions (missing.gen
and missing.gen0
) are also provided to generate Missing Completely At Random (MCAR) values on a data matrix.
Package: | GenForImp |
Type: | Package |
Version: | 1.0 |
Date: | 2015-02-27 |
License: | GPL-3 |
Nadia Solaro, Alessandro Barbiero, Giancarlo Manzi, Pier Alda Ferrari
Maintainer: Alessandro Barbiero <alessandro.barbiero@unimi.it>
Solaro, N., Barbiero, A., Manzi. G., Ferrari, P.A. (2014). Algorithmic-type imputation techniques with different data structures: Alternative approaches in comparison. In: Vicari, D., Okada, A., Ragozini, G., Weihs, C. (eds), Analysis and modeling of complex data in behavioural and social sciences, Studies in Classification, Data Analysis, and Knowledge Organization. Springer International Publishing, Cham (CH): 253-261 http://link.springer.com/chapter/10.1007/978-3-319-06692-9_27
Solaro, N., Barbiero, A., Manzi, G., Ferrari, P.A. (2015) A sequential distance-based approach for imputing missing data: The Forward Imputation. Under review
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