因变量为四分类怎样用真实标签和预测标签做ROC曲线?请告诉R代码。
时间: 2024-06-10 18:07:21 浏览: 11
可以使用multiclass.roc函数来绘制四分类的ROC曲线。以下是R代码示例:
```r
# 导入实际标签和预测标签
actual_labels <- c(0, 1, 2, 0, 3, 1, 2, 3, 0, 3) # 实际标签
predicted_labels <- c(0, 1, 1, 0, 3, 2, 2, 3, 0, 3) # 预测标签
# 导入pROC包
library(pROC)
# 将实际标签和预测标签传递给multiclass.roc函数,并获取每个类的ROC信息
roc_info <- multiclass.roc(actual_labels, predicted_labels)
# 绘制四分类ROC曲线
plot(roc_info$roc[[1]], col = "red", type = "l", main = "Four-class ROC Curve")
lines(roc_info$roc[[2]], col = "blue", type = "l")
lines(roc_info$roc[[3]], col = "green", type = "l")
lines(roc_info$roc[[4]], col = "purple", type = "l")
# 添加图例
legend("bottomright", legend = c("Class 0", "Class 1", "Class 2", "Class 3"), col = c("red", "blue", "green", "purple"), lty = 1)
```
希望我的回答对你有所帮助。如果你还有其他问题,请随时提出。
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