Non parametric zero replacement strategies: Non parametric zero replacement strategies
Description
Non parametric zero replacement strategies.
Usage
zeroreplace(x, a = 0.65, delta = NULL, type = "multiplicative")
Arguments
x
A matrix with the compositional data.
a
The replacement value (\(\delta\)) will be "a" times the minimum value observed in the compositional data.
delta
Unless you specify the replacement value \(\delta\) here.
type
This can be any of "multiplicative", "additive" or "simple". See the references for more details.
Value
A matrix with the zero replaced compositional data.
Details
The "additive" is the zero replacement strategy suggested in Aitchison (1986, pg. 269).
All of the three strategies can be found in Martin-Fernandez et al. (2003).
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): 253-278.
Aitchison J. (1986). The statistical analysis of compositional data. Chapman & Hall.