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单项选择题

Which estimator is positive semi-definite?
A、long run variance-covariance estimator
B、OLS
C、Newey and West (1987) HAC estimator
D、t test statistic

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相关考题

单项选择题

Pursuant to the 2015 Food Safety Law, pre-packaged food must be labeled and must include the following information, except: A.
Name, specification, net content, and date of production B.
Shelf life C.
Trademark D.
Storage requirements

单项选择题

A．3
B．0
C．2
D．1

多项选择题

以下哪些结论正确？
A、有功功率守恒

B、无功功率守恒

C、复功率守恒

D、视在功率守恒

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