Zero-clustered data occur widely in medical research and are characterised by the presence of a group of observations of value zero in a distribution of otherwise continuous non-negative responses. A simulation study was conducted to investigate the properties of a number of correlation coefficients applied to samples of zero-clustered data.
Huson, L. W.
"Performance of Some Correlation Coefficients When Applied to Zero-Clustered Data,"
Journal of Modern Applied Statistical Methods: Vol. 6
, Article 17.
Available at: http://digitalcommons.wayne.edu/jmasm/vol6/iss2/17