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问题的提出在比较两条回归线时,目前多用两种假设检验:(1)比较两个回归系数:b_1与 b_2,其 H_0为β_1=β_2,H_1为β_1(?)β_2(双侧检验)。
The problem is presented in the comparison of two regression lines. At present, two hypotheses are used to test: (1) Compare two regression coefficients: b_1 and b_2, whose H_0 is β_1=β_2, and H_1 is β_1(?)β_2 (two-sided test).