多项选择题采用对数变换可以降低异方差的影响的优点是A. 使变量的测量值变小 B. 对数线性变换有经济学意义 C. 可以不用了解异方差的先验信息 D. 会使方差比较稳定 E. 对数变换一定能消除异方差的影响
单项选择题The bond whose market price is lower than its par value is called a discount bond. The amount the market price of a discounted bond is less than its par value is a compensation for the coupon rate lower than the rate or return required in the market. A、正确 B、错误