Imputation of zeros and nondetects in compositional data sets

Description

Following compositional data analysis principles, this package implements simple functions to explore and replace left-censored data, such as rounded zeros or values below single or multiple limits of detection (nondetects), and count zeros.

Details

Author(s)

Javier Palarea-Albaladejo and Josep Antoni Martin-Fernandez

Maintainer: Javier Palarea-Albaladejo <javier.palarea@bioss.ac.uk>

References

Martin-Fernandez, J.A., Barcelo-Vidal, C., Pawlowsky-Glahn, V., 2003. Dealing with zeros and missing values in compositional data sets using nonparametric imputation. Mathematical Geology 35 (3): 253-27.

Martin-Fernandez, J.A., Hron, K., Templ, M., Filzmoser, P., Palarea-Albaladejo, J., 2012. Model-based replacement of rounded zeros in compositional data: Classical and robust approaches. Computational Statistics and Data Analysis 56: 2688-2704.

Martin-Fernandez, J.A., Hron, K., Templ, M., Filzmoser, P., Palarea-Albaladejo, J., 2015. Bayesian-multiplicative treatment of count zeros in compositional data sets. Statistical Modelling 15 (2): 134-158.

Palarea-Albaladejo, J., Martin-Fernandez, J.A., Gomez-Garcia, J., 2007. A parametric approach for dealing with compositional rounded zeros. Mathematical Geology 39 (7): 625-645.

Palarea-Albaladejo, J., Martin-Fernandez, J.A., 2008. A modified EM alr-algorithm for replacing rounded zeros in compositional data sets. Computers & Geosciences 34 (8): 902-917.

Palarea-Albaladejo, J., Martin-Fernandez, J.A., 2013. Values below detection limit in compositional chemical data. Analytica Chimica Acta 764: 32-43.

Palarea-Albaladejo, J., Martin-Fernandez J.A., Olea, R.A., 2014. A bootstrap estimation scheme for chemical compositional data with nondetects. Journal of Chemometrics 28: 585-599.

Palarea-Albaladejo J. and Martin-Fernandez J.A., 2015. zCompositions – R package for multivariate imputation of left-censored data under a compositional approach. Chemometrics and Intelligent Laboratory Systems 143: 85-96.

See Also

Aitchison, J., 1986. The Statistical Analysis of Compositional Data. Monographs on Statistics and Applied Probability. Chapman and Hall Ltd., London, UK (re-edited in 2003 with additional material).

Pawlowsky-Glahn, V., Buccianti, A. (Eds.), 2011. Compositional Data Analysis: Theory and Applications. John Wiley & Sons, Ltd., Chichester,UK.

Results