我如何在R中的二元逻辑回归中实现分类变量?我想测试专业领域(学生,工人,教师,自雇人士)对购买产品概率的影响。
在我的例子中,y是一个二进制变量(1表示购买产品,0表示不购买)。
- x1:是性别(0男性,1女性)
- x2:是年龄(20到80之间)
- x3:是分类变量(1 =学生,2 =工人,3 =老师,4 =自雇)
set.seed(123)
y<-round(runif(100,0,1))
x1<-round(runif(100,0,1))
x2<-round(runif(100,20,80))
x3<-round(runif(100,1,4))
test<-glm(y~x1+x2+x3, family=binomial(link="logit"))
summary(test)
如果我在上面的回归中实现x3(专业领域),我得到x3的错误估计/解释。
我需要做些什么来获得分类变量(x3)的正确影响/估计?
非常感谢
答案 0 :(得分:0)
我建议你将x3设置为因子变量,不需要创建假人:
set.seed(123)
y <- round(runif(100,0,1))
x1 <- round(runif(100,0,1))
x2 <- round(runif(100,20,80))
x3 <- factor(round(runif(100,1,4)),labels=c("student", "worker", "teacher", "self-employed"))
test <- glm(y~x1+x2+x3, family=binomial(link="logit"))
summary(test)
Here is the summary:
这是您模型的输出:
Call:
glm(formula = y ~ x1 + x2 + x3, family = binomial(link = "logit"))
Deviance Residuals:
Min 1Q Median 3Q Max
-1.4665 -1.1054 -0.9639 1.1979 1.4044
Coefficients:
Estimate Std. Error z value Pr(>|z|)
(Intercept) 0.464751 0.806463 0.576 0.564
x1 0.298692 0.413875 0.722 0.470
x2 -0.002454 0.011875 -0.207 0.836
x3worker -0.807325 0.626663 -1.288 0.198
x3teacher -0.567798 0.615866 -0.922 0.357
x3self-employed -0.715193 0.756699 -0.945 0.345
(Dispersion parameter for binomial family taken to be 1)
Null deviance: 138.47 on 99 degrees of freedom
Residual deviance: 135.98 on 94 degrees of freedom
AIC: 147.98
Number of Fisher Scoring iterations: 4
无论如何,我建议你在R-bloggers上研究这篇文章: https://www.r-bloggers.com/logistic-regression-and-categorical-covariates/