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The Federal Reserve Bank of New York uses a coincident index to track the New York, New Jersey and New York City economies.

They define a coincident index as:

“A coincident index is a single summary statistic that tracks the current state of the economy. “

The Fed results share no analysis but state:

Our Indexes of Coincident Economic Indicators (CEI) for January show economic activity expanded at a brisk pace in New York State and New York City, but was essentially flat in New Jersey.