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Câu 14. Dấu hiệu nào dưới đây dùng để nhận biết hiện tượng đa cộng tuyến?A. Mô hình có R2 cao nhưng tỉ số t thấp.B. Tồn tại các biến giải thích trong mô hình có tương quan cao với nhau.C. Hồi quy một biến giải thích theo các biến giải thích khác có trong mô hình cho kết quả hàm hồi quy phù hợp.D. cả A, B và C.
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