4.10 Example #1: Compare Actual Data to Predicted Data
Third, are the actual data different from what we predicted? No. The treatment data look just like a continuation of the baseline data. So, for this graph, the answer is no, the data are not different and there is no 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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