Correlation measures the linear relationship between two variables. By measuring and relating the variance of each variable, correlation gives an indication of the strength of the relationship. To ...

We develop Mardia's concept of a linear-circular correlation coefficient, obtaining distributions of statistics under various hypotheses. Mardia's data on simian natality are discussed in the light of ...

A quantitative study is made of the bias in the usual estimate of the linear correlation coefficient and of the relative efficiency of the estimated regression, when a certain type of selective ...