To calculate standard deviation, find the mean, calculate each value’s deviation, square them, average the squared deviations, and take the square root.
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C
3 weeks agoStandard 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.
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R
3 weeks agoFind 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.
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M
4 days agoStandard 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:
- Find the mean of your data set.
- Subtract the mean from each value, square the result.
- Average those squared differences (this is variance).
- 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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