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Stock Trading

Stock Trading

In Stock Trading, standard deviation is a statistical measure that is used to describe the volatility or risk of a stock or portfolio. It measures how much the returns of a stock or portfolio deviate from its average or mean return over a given period of time.
A stock or portfolio with a high standard deviation has a wide range of returns and is considered to be more volatile or risky than a stock or portfolio with a low standard deviation. Conversely, a stock or portfolio with a low standard deviation has a narrow range of returns and is considered to be less volatile or risky.
Standard deviation is calculated by taking the square root of the variance, which is the average of the squared differences between each data point and the mean. Once the standard deviation is calculated, it is expressed as a percentage of the mean return.
Standard deviation can be used in several ways in stock trading such as: -
  • Assessing the risk of a stock or portfolio by comparing its standard deviation to that of the overall market or to a benchmark index.
  • Identifying stocks or portfolios that are trading at a discount or premium to their historical volatility.
  • In portfolio construction and diversification, where investors aim to spread their investments across different stocks and sectors to reduce the overall risk of the portfolio by balancing high-volatility stocks with low-volatility stocks.
It's worth noting that standard deviation is only one of several measures of risk and volatility, and other measures such as beta or Value at Risk (VaR) may also be used to assess risk in stock trading.
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