![]() This is because follow-up sales are correlated with baseline sales. Notice the variability within each group is much lower compared to the variability in the previous plot. ![]() Let’s read the data into R and prepare for analysis.Īes(x = baseline, y = post, color = trt) + Then the new promotions are implemented for a period of time and the products sales are recorded again (i.e., the follow-up measure). Prior to implementing the different promotion treatments, existing products sales are recorded (i.e., the baseline measure).
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