How to Calculate Standard Deviation
How to Calculate Standard Deviation Formula
A statistical measure of the degree to which an individual value in a probability distribution tends to vary from the mean of the distribution. The square root of the variance.
When returns are normally distributed, an individual return will fall within one standard deviation of the mean about two-thirds of the time. For example, if a portfolio had an expected return of 5% and an expected risk (standard deviation) of 13, then:
| One Standard | 68% of the time, returns can be expected |
| Two Standard | 95% of the time, returns can be expected |
Standard deviation is a useful historical measure of the variability of return earned by an investment portfolio. In performance measurement, it is generally assumed that a larger degree of dispersion implies that greater risk was taken to achieve the return.
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