如何将模型系数乘以数字?

时间:2019-06-01 09:57:03

标签: r regression coefficients

您好,我想缩放模型的系数。这就是为什么我准备了这个小例子。 我想将 MPG.city,MPG.highway,马力的系数与“校正系数” 相乘。任何想法如何乘或校正系数?

library(MASS)
data("Cars93")

Cars_new = Cars93[,c(4,5,6,7,8,13,14)]
fit<-lm(Price~.,data=Cars_new)

#model output should be list
fit<-list(fit)

#correction factor for MPG.city, MPG.highway,Horsepower
correction<-c(1.2,1.23,1.6)

编辑 模型输出是一个列表!

model output loos like this

1 个答案:

答案 0 :(得分:2)

您可以按名称选择系数

fit[[1]]$coefficients[c("MPG.city", "MPG.highway", "Horsepower")] <- 
   fit[[1]]$coefficients[c("MPG.city", "MPG.highway", "Horsepower")] * correction

#[[1]]

#Call:
#lm(formula = Price ~ ., data = Cars_new)

#Coefficients:
#(Intercept)    Min.Price    Max.Price     MPG.city  MPG.highway   Horsepower      RPM  
# -2.424e-02    5.010e-01    4.999e-01   -1.639e-04    1.029e-03   -1.504e-04   -1.293e-07