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How should I deal with outliers when doing correlations? Rank-based and other correlations (percentage bend) which are robust to non-Normal data How do I correlate change in score with the score at baseline? How do I measure agreement to see if two measures are measuring the same thing (Bland and Altman plots)? Can I do a correlation between two variables where one variable is less than or equal to the other? How do I produce nonparametric Spearman partial correlations using SPSS? What is Collinearity in multiple regression, and what do I do about it? How do I compare a pair of correlations? How do I obtain an average correlation? How do I work out reliability for three or more items? (Cronbach's alpha, composite reliability and Raykov's rho) What thresholds should I use for convergent validity? How do I test if a correlation is zero and obtain its confidence interval? How many degrees of freedom are associated with a test of whether a zero-order or multiple correlation equals zero? How do I estimate a pooled correlation using multiple scores from a set of subjects? How do I adjust p-values to test if more than one correlation is zero? How do I obtain a 95% confidence interval for a correlation (or slope in a simple regression) in SPSS? How do I adjust a correlation for group differences (using partial and semi-partial correlations)? Power calculations for testing if correlations equal zero What are polychoric correlations and how do I compute them and use in SPSS? What are intraclass correlations and how do I use them? How do I compute consistency across subjects using an intraclass correlation? A note on correcting for restriction of ranges which underestimate Pearson correlations What is the relationship between significance tests of regression coefficients and of correlation coefficients?