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Placebo effects vary according to
Third Variable
An unmeasured variable that may influence or confound the relationship between the two variables of interest in a study.
Spearman Rank
An assessment of rank correlation that doesn't rely on parametric assumptions, used to evaluate how effectively a monotonic function can represent the association between two variables.
Ordinal-Level
Refers to a level of measurement where data can be ordered or ranked, but the distances between ranks are not necessarily equal.
Point Biserial
A correlation coefficient used to measure the relationship between a binary variable and a continuous variable.
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