== Testing if a correlation is zero == Howell DC (2002) details the method to test if a correlation zero using Fisher's transformation. This [[attachment:corr.xls|spreadsheet]] performs this calculation returning a z value. A confidence interval for a correlation may be computed using the on-line calculator [[https://www.statology.org/confidence-interval-correlation-coefficient-calculator/|given here]] and for a matrix of Pearson correlations using the SPSS macro of Weaver and Koopman available from [[https://sites.google.com/a/lakeheadu.ca/bweaver/Home/statistics/spss/my-spss-page/rhoci | from here.]] Reference: Howell DC (2002) Statistical methods for psychology. Fifth Edition. Wadsworth:Pacific Grove, CA. Weaver B and Koopman R (2014) An SPSS Macro to Compute Confidence Intervals for Pearson’s Correlation. To appear in ''The Quantitative Methods for Psychology'' in Spring 2014.