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How do I calculate two standard deviations away from the stock price?

How would I figure out how many basis points "two standard deviations" is based on the current spot price? For example, the S&P 500 is trading at about $1671.20. What is two standard deviations ...
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What are the minimum investment requirements for the S&P500 spyder (NYSE:SPY)?

The current price for the S&P500 SPDR ETF is about USD 150, so I would guess that I need approximately USD 15,000 to purchase the minimum lot of 100 shares, as well as the transaction costs, which ...
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What is the daily rebalanced leverage ratio that is ideal for the S&P 500 based on past performance?

This question assumes an investor with a very low risk-aversion coefficient. The risk-aversion coefficient is basically the 2nd-derivative of an investor's utility function as a function of money. An ...