In 1922 R. A. Fisher introduced the modern regression model, synthesizing the regression theory of Pearson and Yule and the least squares theory of Gauss. The innovation was based on Fisher’s realization that the distribution associated with the regression coefficient was unaffected by the distribution of X. Subsequently Fisher interpreted the fixed X assumption in terms of his notion of ancill...

Detecting dependence between two random variables is a fundamental problem. Although the Pearson correlation coefficient is effective for capturing linear dependence, it can be entirely powerless for detecting nonlinear and/or heteroscedastic patterns. We introduce a new measure, G-squared, to test whether two univariate random variables are independent and to measure the strength of their rela...

introduction: today, breast cancer is one of the most common causes of mortality and morbidty and also the leading health concern of the world. methods: this research was a descriptive study entitled knowledge, attitude and practice regarding prevention of breast cancer in working women of chaloos city. the sample size of study included 612 women working in governmental centers. the instrument ...

Two measures of association for dichotomous variables, the phi-coefficient and the tetrachoric correlation coefficient, are reviewed and differences between the two are discussed in the context of the famous so-called Pearson-Yule debate, that took place in the early 20th century. The two measures of association are given mathematically rigorous definitions, their underlying assumptions are for...

the aim of the present research was to investigate the relationship between the components of organizational intelligence and organizational culture in physical education general office and offices in east azerbaijan province. the present research was a descriptive – correlation one and performed as a field. the statistical population consisted of the staff of physical education general office ...

Purpose: Lesion volume is a meaningful measure in multiple sclerosis (MS) prognosis. Manual lesion segmentation for computing volume in a single or multiple time points is time consuming and suffers from intra and inter-observer variability. Methods: In this paper, we present MSmetrix-long: a joint expectation-maximization (EM) framework for two time point white matter (WM) lesion segmentation....

1. INTRODUCTION Many methodological studies depend on the product of two dependent correlation coefficients. For example, the product of two dependent correlation coefficients is needed in assessing the impact of a confounding variable on a regression coefficient (Frank, 2000). In the literature, there is an extensive research on the distribution of a single correla-but little on the distributi...