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某商品需求函数为Yi=β0+β1Xi+μi,其中为需求量,为价格。为了考虑“地区”(农村、城市)和“季节”(春、夏、秋、冬)两个因素的影响,拟引入虚拟变量,则应引入虚拟变量的个数为()。
- A、2
- B、4
- C、5
- D、6
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