📝 **Question:** In a panel of 100 stores, what's the right way to compute a 7-day lag of sales?
📋 Pick the right answer.
💡 **Hint:** Re-read the theory above if unsure.
📝 **Question:** In a panel of 100 stores, what's the right way to compute a 7-day lag of sales?
📋 Pick the right answer.
💡 **Hint:** Re-read the theory above if unsure.
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