numeric data matrix or dataframe with at least two columns.
na.action
a function which indicates what should happen when the data
contain 'NA's. Default is to fail.
Author
Klaus Nordhausen
Details
This location estimate is defined for a \(n \times p\) matrix X as
$$ \frac{1}{p} ave_{i}\{[(x_{i}-\bar{x})S^{-1}(x_{i}-\bar{x})'] x_{i}\},$$
where \(\bar{x}\) is the mean vector and \(S\) the regular covariance matrix.
References
Oja, H., Sirki?, S. and Eriksson, J. (2006), Scatter matrices and independent component analysis, Austrian Journal of Statistics, 35, 175--189.