For example, let's use the retail market's target of sales to sales last year. Retail has traditionally looked at this on a daily basis, as well as rolled up to the week, month, quarter, and year. I have two primary concerns with this:
- If the weather was bad, we ran a promotion, or some other contributing factor, we may not know it and are really not comparing apples to apples. Additionally, what if last year was really bad? Beating that number doesn't do much for us.
- If we are reviewing this on a daily basis, we loose institutional knowledge due to the repetition. What if we miss a day? Is there any repercussion? What if we miss three days in a row? What if we miss 10 days out of 14? Were there enough days in there of good performance to hide the fact that a trend is occurring?