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Post Info TOPIC: Standard deviation


L

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Standard deviation
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CI(nSigma) = erf(n/sqrt(2))

Sigma

Confidence Interval 

1

0.6826894850

2

0.9544997241

3

0.9973002038

4

0.9999366575

5

0.9999994267

6

0.9999999980



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L

Posts: 129665
Date:
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Standard deviation, or lower case sigma, measures the spread, or deviation, of data about a central tendency, such as the mean or the median in a data set or group, with a Gaussian (bell curve) distribution.

Standard deviation is a widely used measure of variability or diversity used in statistics and probability theory. It shows how much variation or "dispersion" exists from the average (mean, or expected value). A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data points are spread out over a large range of values.
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