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Câu 71: khi đa cộng tuyến không hoàn hảo xảy ra:A. các ước lượng OLS là không thể xác định đượcB. có thể khẳng định hai hay nhiều biến giải thích trong mô hình có tương quan caoC.các ước lượng OLS là chệch ngay cả khi cỡ mẫu n>100D.các sai số ngẫu nhiên lớn và tương quan với nhau.
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