Implementation of robust model based cluster analysis with missing data.
The models used are: Multivariate Contaminated Normal Mixtures (MCNM),
Multivariate Student's t Mixtures (MtM), and Multivariate Normal Mixtures (MNM)
for data sets with missing values at random.
"Cluster analysis and outlier detection with missing data"
Hung Tong, Cristina Tortora (2020)