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Results tagged with standard-deviation
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user 2902
Standard deviation is the square root of the variance of a random variable, an estimator thereof, or a similar measure of the spread of a batch of data.
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How do I calculate a weighted standard deviation? In Excel?
The formula for weighted standard deviation is:
$$ \sqrt{ \frac{ \sum_{i=1}^N w_i (x_i - \bar{x}^*)^2 }{ \frac{(M-1)}{M} \sum_{i=1}^N w_i } },$$
where
$N$ is the number of observations.
$M$ is the …
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