2-13 Average measures of effects can be misleading

For outcomes that are measured on a scale (e.g. weight or pain) the difference between the average in one treatment group and the average in a comparison group may not make it clear how many people experienced a big enough change (e.g. in weight or pain) for them to notice it, or that they would regard as important.

When outcomes are measured on a scale, it cannot be assumed that everyone has experienced the average effect of a treatment.

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Means vs. Medians

Keith Bower’s 3-min video explaining how means (averages) and medians can be presented misleadingly.


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