线性响应模型
在 R 中构建响应模型
Kathrin Gruber
Assistant Professor of Econometrics Erasmus University Rotterdam
模型要素
线性响应函数
$$\textsf{SALES} = f(\textsf{PRICE})$$
构建销售的线性响应模型
linear.model <- lm(SALES ~ PRICE , data = sales.data)
coef(linear.model)
(Intercept) PRICE
274.2486 -134.3097
生成预测
coef(linear.model)[1] + 0.95 * coef(linear.model)[2]
146.6544
coef(linear.model)[1] + 1.05 * coef(linear.model)[2]
133.2234
预测性能
plot(SALES ~ PRICE, data = sales.data)
abline(linear.model)
