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sample vs population covariance
CFA Vol 4 Reading 50 problem 1
calculating std deviation and covariance of 6 months of returns
The answer key treats it like a population variance/covariance and divides by n=6 for both calculations.
In the text on p.234, it states treat like sample data and divide by n1 (5 in this case).
Anyone know if there is an explanation? or is the answer key wrong? |
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发表于 2013-4-4 03:59
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