【单选题】In the regression of y on x, the error term exhibits heteroskedasticity if _____.
A.
it has a constant variance
B.
Var(y|x) is a function of x
【判断题】MTM指标也叫动量指标,是使用收盘价和成交量计算得出的。
【单选题】把下列句子组成语意连贯的语段,排序最恰当的一项是 ( ) 1他们的一些优秀作品的产生标志着中国现代戏剧文学的日臻成熟。 2剧坛上除田汉、洪深、欧阳予倩、丁西林等,又涌现出曹禺、夏衍、于伶等著名剧作家。 3曹禺1934年发表了震动剧坛的《雷雨》,翌年又创作了《日出》。 4这个阶段戏剧创作队伍更加扩大,作品质量普遍提高。 5曹禺的这两个剧本和不久后完成的《原野》,不仅显示了剧作家向更深的社会题材开掘的...
【判断题】按比例定员的方法只能给酒店餐饮部配员一个框架,具体配员时还应考虑餐饮部规模、不同岗位设备设施因素。( )
【单选题】In the regression of y on x , the error term exhibits heteroskedasticity if _____.
A.
Var( y | x ) is a function of x
B.
it has a constant variance
【单选题】In the balance of payments, the statistical discrepancy or error term is used to ( )
A.
Ensure that the sum of all debits matches the sum of all credits.
B.
Ensure that imports equal the value of exports.
C.
Obtain an accurate account of a balance-of-payments deficit.
D.
Obtain an accurate account of a balance-of-payments surplus.
【判断题】The key assumption for the general multiple regression model is that all factors in the unobserved error term be correlated with the explanatory variables.