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awarded  Popular Question
Jul
26
revised Matrix Multiplication in 3 Dimensions
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26
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26
accepted Matrix Multiplication in 3 Dimensions
Jul
25
asked Matrix Multiplication in 3 Dimensions
Feb
8
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Feb
8
comment Why does sample standard deviation underestimate population standard deviation?
@joriki: that first part about taking all data as one big single sampling makes a lot of sense! Thanks! I know how to deal with the skewing (since it is in the article I linked). What I do not know is WHY the skewing exists? Please see my edited question.
Feb
8
awarded  Editor
Feb
8
revised Why does sample standard deviation underestimate population standard deviation?
re-framed question after getting some responses
Feb
8
comment Why does sample standard deviation underestimate population standard deviation?
@Andre: I now understand that s^2 is a RV whose mean is the population variance while the value I obtain in my experiment would be a realized value of this RV. Thanks for making this distinction.
Feb
8
comment Why does sample standard deviation underestimate population standard deviation?
So, do you mean that if I were to perform an experiment where I take many samplings from a population: if I first compute the unbiased estimator for population variance from each sampling; then get the mean of all these values; followed by taking the square root of this mean; I will get the unbiased estimator for population standard deviation?
Feb
8
asked Why does sample standard deviation underestimate population standard deviation?