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若都作为名义变量,那么其回归方程以代码变量来表示,即为,若都作为名义变量,那么其回归方程以实际变量来表示,则为,若把温度作为数值变量,那么其回归方程以代码变量来表示仍与前述相同,即为,若把温度作为数值变量,那么其回归方程以实际变量来表示,则为,若把两者都作为数值变量,那么其回归方程以代码变量来表示仍与前述相同,即为,若把两者都作为数值变量,那么其回归方程以实际变量来表示,则为,从一侧面也说明,以代码变量进行回归分析的优越性,Interaction between adding sugar to coffee and stirring the coffee.Neither of the two individual variables has much effect on sweetness but a combination of the two does.Interaction between adding carbon to steel and quenching.Neither of the two individually has much effect on strength but a combination of the two has a dramatic effect.http:/,