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Re: Arbitrends(tm) Available (Slightly Earlier It Seems)
Actually the Boston trend was a day late. Whenever you get a trend you can count ahead exactly four weeks and that's the date of the next one - within a day.
The big exception is a seven week gap between the Fall Book date in January and Phase I in February. That's because Arbitron takes three weeks off between the Fall and Winter books. They also take a week between the Spring and Summer books. Being basically a 28-day cycle, the delivery date moves back two or three days each month. In January it can come in the single digits.