Sample standard deviation
Encyclopedia
A sample standard deviation is an estimate, based on a sample, of a population standard deviation
Standard deviation
Standard deviation is a widely used measure of variability or diversity used in statistics and probability theory. It shows how much variation or "dispersion" there is from the average...

. See:
  • Standard deviation#Estimation
  • Sample mean and sample covariance
    Sample mean and sample covariance
    The sample mean or empirical mean and the sample covariance are statistics computed from a collection of data on one or more random variables. The sample mean is a vector each of whose elements is the sample mean of one of the random variables that is, each of whose elements is the average of the...

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