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Câu 30. Dấu hiệu nào dưới đây dùng để nhận biết hiện tượng đa cộng tuyến?A. Mô hình có R2 cao nhưng tỉ số thấp.B. Thống kê d của kiểm định DW thỏa mãn 0 < d < Du.C. Biểu đồ phần dư cho thấy, phần dư có xu hướng biến đổi theo thời gian.D. Thống kê JB của kiểm định Jacque - Bera nằm trong miền bác bỏ giả thuyết.
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