Which of the following is an assumption on which time series regression is based?
A. A time series process follows a model that is nonlinear in parameters.
B. In a time series process, no independent variable is a perfect linear combination of the others.
C. In a time series process, at least one independent variable is a constant.
D. For each time period, the expected value of the error ut, given the explanatory variables for all time periods, is positive.
Answer: B
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