Assertion: distribution's form | /r/HasProperty | chi-square
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Source sentences:
text: standard normal random variables and A {\displaystyle A} is a k × k {\displaystyle k\times k} symmetric, idempotent matrix with rank k − n {\displaystyle k-n} , then the quadratic form Y T A Y {\displaystyle Y^{T}AY} is chi-square distributed with k − n {\displaystyle k-n} degrees of freedom.