4.11 “Different” Means Slope OR Level Is Different From Prediction Line

When we ask if the actual data are different from what we would predict, we want to see if either the slope or the level is different. In the last example, the actual data weren’t different from what we predicted—they fall right along the prediction line. This is NOT a basic effect.

An Extend Line graph visualizing the contrast between baseline and treatment during the Treatment Phase.
The treatment data are NOT DIFFERENT than what we expected. This is NOT a basic effect.

Are the actual treatment data DIFFERENT than what you would have predicted, given the baseline data?

Estimate the baseline slope

Extend that line into the treatment phase

Evaluate whether the slope or level of the actual treatment data are different from what you predicted

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