4.15 Example #2: Compare Actual Data to Predicted Data

Here are the actual data. These data are different because they are sloping downward. He’s ripping up his paper fewer times every day during treatment. So, yes, the actual data in the treatment phase are different than what we would predict based on the baseline phase.

An example graph comparing the actual data for treatment and baseline.
The treatment data ARE DIFFERENT than what we expected. This is 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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