Y/Y stands for "year-over-year."

It's a comparison used to evaluate the rate of change in statistics, interest rates or other financial performance measures.

If you have a CPI value of 200, for example, and one year later the CPI is 210, that is a 5% y/y increase.

Y/Y measures eliminate the effects of seasonality because they compare similar periods of time (e.g., this month versus the same month last year).

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