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What is S&P term?

What is S&P term?

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I found the term in time series analysis course, especially in white noise. What does the term mean?

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365 Team
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Hi Samuel,
Thanks for reaching out. 
The S&P500 or simply the S&P measures the stock performance of 500 large companies listed on stock exchanges in the United States. 
It is a very good proxy of the US (and world) economy and is the preferred index to look at when getting acquainted with time series data.
Best,
The 365 Team