4.14 Example #2: Extend Line into Treatment Phase

If we project the baseline slope into the treatment phase, we expect the number of times he rips his paper to stay right around 17 with a flat slope, as this dotted line shows.

A graph illustrating the contrast between treatment and baseline, exemplified by an extended line in the treatment phase.

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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