Tag
correlation
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Pearson or Spearman correlation: which should you use?
What Pearson's r and Spearman's rho each measure, when they disagree (curved relationships and outliers), and how to pick and report one.
Read the answer →Regression to the mean vs the gambler's fallacy: what is the difference?
Why expecting an extreme score to be followed by a more ordinary one is sound, while expecting a streak to be balanced out is a fallacy.
Read the answer →What does r mean when it is reported next to a t test, and how do you turn it into d?
Why papers report an r with a t test, how it is computed from t, what r squared means, how to convert r to Cohen's d, and how to report it in APA style.
Read the answer →What goes wrong if you sort x and y separately before a regression?
Sorting each variable on its own breaks the pairs, so the fit looks excellent whatever the real relationship is. It predicts new data worse than the mean.
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