【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。
【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.