# correlation

## Sampling variance of Pearson r in a two-level design

Consider Pearson’s correlation coefficient, $$r$$, calculated from two variables $$X$$ and $$Y$$ with population correlation $$\rho$$. If one calculates $$r$$ from a simple random sample of $$N$$ observations, then its sampling variance will be approximately

## A meta-analytic approach to examine the relationship between religion/spirituality and mental health in cancer

Religion and spirituality (R/S) are patient-centered factors and often are resources for managing the emotional sequelae of the cancer experience. Studies investigating the correlation between R/S (eg, beliefs, experiences, coping) and mental health …

## A meta-analytic review of religious or spiritual involvement and social health among cancer patients

Religion and spirituality (R/S) play an important role in the daily lives of many cancer patients. There has been great interest in determining whether R/S factors are related to clinically relevant health outcomes. In this meta-analytic review, the …

## Religion, spirituality, and physical health in cancer patients: A meta-analysis

Although religion/spirituality (R/S) is important in its own right for many cancer patients, a large body of research has examined whether R/S is also associated with better physical health outcomes. This literature has been characterized by …

## Converting from d to r to z when the design uses extreme groups, dichotomization, or experimental control

Meta-analyses of the relationship between 2 continuous variables sometimes involves conversions between different effect sizes, but methodological literature offers conflicting guidance about how to make such conversions. This article provides …

## Another project idea: Meta-analytic methods for correlational data

Several different approaches have been proposed for meta-analysis of correlation coefficients. One of the major differences between approaches is the choice of scale: whether effect sizes should be analyzed on the Pearson-r scale or first transformed to the Fisher-z scale.