Year over year
Also called YoY, YoY growth, year on year.
A comparison of a period with the same period a year earlier, to see growth after seasonality.
YoY change = (this period − the same period last year) ÷ the same period last year × 100. From 1,200 orders last October to 1,380 this October is +15 percent. (Example numbers.)
It removes the seasonality a month-over-month comparison cannot: a store that compares December with November sees a boom every year, and a crash every January. For daily and weekly numbers, compare with the days 364 days back (52 weeks), so a Saturday lines up with a Saturday; for whole months and quarters, use the same dates.
A YoY change is only as good as the tracking behind both years: a new tag, a consent banner or a new bot filter can move the counts more than the business did. See year over year comparison in analytics.
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