【R语言】ROC检验(与随机猜测,即AUC=0.5比较)

来源

  • 包:verification
  • 函数:roc.area
  • 官方文档:https://www.rdocumentation.org/packages/verification/versions/1.42/topics/roc.area

参数

  • obs: 标签(0 或 1)
  • pred: 预测值(0-1之间的概率)

输出

  • A: AUC值
  • n.total: 总的样本个数
  • n.events: 正样本个数
  • n.noevents: 负样本个数
  • p.value: P值 (与随机猜测,即AUC=0.5比较)

样例

a<- c(1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990,
 1991, 1992, 1993, 1994, 1995)
b<- c(0,0,0,1,1,1,0,1,1,0,0,0,0,1,1)
c<- c(.8, .8, 0, 1,1,.6, .4, .8, 0, 0, .2, 0, 0, 1,1)
d<- c(.928,.576, .008, .944, .832, .816, .136, .584, .032, .016, .28, .024, 0, .984, .952)

A<- data.frame(a,b,c, d)
names(A)<- c("year", "event", "p1", "p2")

## for model with ties
roc.area(A$event, A$p1)

## for model without ties
roc.area(A$event, A$p2)

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