逻辑回归混淆矩阵
Logistic regression confusion matrix
下面是我本学期作业的部分代码:
fit2=glm(card~reports+income+age+owner+dependents+months+share, data=new_credit2, family="binomial")
summary(fit2)
####Part G####
pred_prob=predict(fit2,type="response")
head(pred_prob)
length(pred_prob)
# The contrasts() function indicates that R has created a dummy variable with a 1 for =Yes
contrasts(card)
# The following command creates a vector of 1,319 No elements
glm.pred=rep("No",1319)
#The following command transforms all the elements with predicted probabilities of acceptance
greater than 0.5 from No to Yes
glm.pred[pred_prob>.5]="Yes"
head(glm.pred)
head(card)
#table() produces a confusion matrix to determine how many observations were correctly or
incorrectly classified
table(glm.pred,card)
# mean(): computes fraction of individual for which the prediction was correct
mean(glm.pred==card)
当我 运行 时,我得到一个如下所示的矩阵:
card
glm.pred no yes
No 86 232
Yes 210 791
然而,当我 运行 mean() 函数试图获得正确预测的分数时,我得到的结果是 0。我不确定为什么会这样,希望有人能引导我的方向是正确的。
谢谢大家
如果这确实是您的输出,请注意 Yes - yes 和 No - no 的不同拼写。干杯
下面是我本学期作业的部分代码:
fit2=glm(card~reports+income+age+owner+dependents+months+share, data=new_credit2, family="binomial")
summary(fit2)
####Part G####
pred_prob=predict(fit2,type="response")
head(pred_prob)
length(pred_prob)
# The contrasts() function indicates that R has created a dummy variable with a 1 for =Yes
contrasts(card)
# The following command creates a vector of 1,319 No elements
glm.pred=rep("No",1319)
#The following command transforms all the elements with predicted probabilities of acceptance
greater than 0.5 from No to Yes
glm.pred[pred_prob>.5]="Yes"
head(glm.pred)
head(card)
#table() produces a confusion matrix to determine how many observations were correctly or
incorrectly classified
table(glm.pred,card)
# mean(): computes fraction of individual for which the prediction was correct
mean(glm.pred==card)
当我 运行 时,我得到一个如下所示的矩阵:
card
glm.pred no yes
No 86 232
Yes 210 791
然而,当我 运行 mean() 函数试图获得正确预测的分数时,我得到的结果是 0。我不确定为什么会这样,希望有人能引导我的方向是正确的。
谢谢大家
如果这确实是您的输出,请注意 Yes - yes 和 No - no 的不同拼写。干杯