Reporting a correlation matrix in APA style If you are reporting a correlation matrix in APA style, are you supposed to report r as in corr.test() or R^2 as in lm()$r.squared? Which one is correct, and what does the other one represent?
 A: APA publication manual does not explicitly say weather you should choose $R^2$ or $r$ for your results. They say however:
Page 38 of APA Manual:

When reporting the results of inferential statistical tests or when
  providing estimates of parameters or effect sizes, include sufficient
  information to help the reader fully understand the analyses conducted
  and possible alternative explanations for the outcomes of those
  analyses. Because each analytic technique depends on different aspects
  of the data and assumptions, it is impossible to specify what
  constitutes a "sufficient set of statistics" for every analysis.
  However, such a set usually includes at least the following: the
  per-cell sample sizes; the observed cell means (or frequencies of
  cases in each category for a categorical variable); and the cell
  standard deviations, or the pooled within-cell variance. In the case
  of multivariable analytic systems, such as multivariate analyses of
  variance, regression analyses, structural equation modeling analyses,
  and hierarchical linear modeling, the associated means, sample sizes,
  and variance-covariance (or correlation) matrix or matrices often
  represent a sufficient set of statistics. At times, the amount of
  information that constitutes a sufficient set of statistics can be
  extensive; when this is the case, this information could be supplied
  in a supplementary data set or appendix.

The only place with a correlation table is page 136 with this example:

That being said, I would report Person rs with p values for showing correlation results and leave $R^2s$ for regression results
