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Câu 87: Cần phải quan tâm đến hiện tượng đa cộng tuyến hoàn hảo trong hồi quy bội vì:1 điểmA. Rất nhiều biến số kinh tế tương quan hoàn hảo với nhauB. Các ước lượng OLS không còn là ước lượng tuyến tính, không chệch, tốt nhấtC. Các ước lượng OLS không thể tính được trong trường hợp nàyD. Trong thực tế đời sống, ở mọi thời điểm, các biến số kinh tế cùng nhau thay đổi.
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