更为司空见惯的是，他们可能只是假想变量之间的线性关系：当其中一方上升，那么另一方就会按照固定量上升或下降。
Most commonly, they may suppose a linear relationship between variables: when one thing goes up, another goes up or down by a fixed amount.
使用一元线性回归得到了这些因素对水泥色度影响的定量关系。
The quantitative correlation between the factors and cement colorimeter was gained by means of unitary linear regress.
此外，根据线性溶剂化方程建立了定量结构-活性关系用于预测药物肠吸收、血脑屏障通透性和皮肤透过性。
Quantitative structure-activity relationships also have been established to predict drug intestinal absorption, permeation of skin and blood-brain barrier.
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