Using Linear Mixed Models to Model Random Effects and Repeated Measures

A fast food chain plans to add a new item to its menu. However, they are still undecided between three possible campaigns for promoting the new product. In order to determine which promotion has the greatest effect on sales, the new item is introduced at locations in several randomly selected markets. A different promotion is used at each location, and the weekly sales of the new item are recorded for the first four weeks.

This information is collected in testmarket.sav. See the topic Sample Files for more information. Use the Linear Mixed Models procedure to measure the effect of each promotion on sales.

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