当有些自变量的回归系数的数值大小与预期相差很大,甚至正负号与定性分析结果相反时,存在严重的多重共线性问题。( )
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在自变量的相关矩阵中,当自变量间的相关系数较大时会出现多重共线性问题 ( )
A. 对
B. 错
当一些重要的自变量的回归系数的标准误差较大时,我们认为可能存在多重头线性。 ( )
A. 对
B. 错
Which of the term of payment need to be conducted by bank’s draft( )
A. M/T
B. collection
C. L/C
D/D
When ( ) happens the party that fails to perform the contract is allowed to relieve liabilities to non-performance.
A. War
B. world market price goes up
C. manufacture fault
D. currency devaluation