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avatar Richer 1 month ago
How to calculate standard deviation
Understanding how to calculate standard deviation can be useful when analyzing financial data and investment returns. Standard deviation measures how much values vary around their average. Do you use standard deviation when evaluating investments or analyzing business data?
All Replies
  • V

    To calculate standard deviation, find the mean, calculate each value’s deviation, square them, average the squared deviations, and take the square root.

     

     

  • C

    Standard deviation measures how much data values vary from their average. To calculate it, find the mean, subtract it from each value, square the differences, calculate their average, and take the square root. For samples, divide by one less than the number of values.

  • R

    Find the mean, subtract it from each value, square the differences, calculate their average, and take the square root. For samples, divide by n−1; for populations, divide by n.

  • M

    Standard deviation shows how spread out your returns are from the average a small number means steady, predictable performance; a large one means bigger swings (higher risk).

    Formula:

    1. Find the mean of your data set.
    2. Subtract the mean from each value, square the result.
    3. Average those squared differences (this is variance).
    4. Take the square root of variance = standard deviation.

    Yes, it's core to portfolio analysis I use it alongside average returns to judge risk-adjusted performance, not returns alone. A fund with lower SD for similar returns is usually the better pick.

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