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我在R中使用ROCR包 但是我得到了錯誤「預測(預測,標籤): 預測的格式無效」。預測的格式在R中無效ROCR包
請告訴我解決方案。
這裏是代碼:
install.packages("ROCR", dependencies=TRUE)
install.packages("vcd", dependencies=TRUE)
library(ROCR)
library(vcd)
library(boot)
setwd("/Users/Documents/R")
presence <- read.csv("sampleAverages.csv")
background <- read.csv("amplePredictions.csv")
pp <- presence$Logistic.prediction # get the column of predictions
testpp <- pp[presence$Test.or.train=="test"] # select only test points
trainpp <- pp[presence$Test.or.train=="train"] # select only train points
bb <- background$logistic
combined <- c(testpp, bb) # combine into a single vector
label <- c(rep(1,length(testpp)),rep(0,length(bb))) # labels: 1=present, 0=random
pred <- prediction(combined, label) # labeled predictions
perf <- performance(pred, "tpr", "fpr") # True/false positives, for ROC curve
plot(perf, colorize=TRUE) # Show the ROC curve
performance(pred, "auc")@y.values[[1]] # Calculate the AUC
這不會給沒有數據運行。 –
錯誤在哪裏?必須做很多沒有數據。 ROCR小插曲有很好的一步一步的例子[here](http://rocr.bioinf.mpi-sb.mpg.de/ROCR.pdf) –