Question

我遇到了一个奇怪的错误

Error in `[.data.frame`(data, , lvls[1]) : undefined columns selected

当我使用插入符号训练glmnet模型时的

消息。我为序数模型使用了基本上相同的代码和相同的预测变量（然后使用y的不同因素），并且运行良好。计算花费了400个核心小时，因此我无法在此处显示）。

#Source a small subset of data
source("https://gist.githubusercontent.com/FredrikKarlssonSpeech/ebd9fccf1de6789a3f529cafc496a90c/raw/efc130e41c7d01d972d1c69e59bf8f5f5fea58fa/voice.R")
trainIndex <- createDataPartition(notna$RC, p = .75, 
                                  list = FALSE, 
                                  times = 1)


training <- notna[ trainIndex[,1],] %>%
  select(RC,FCoM_envel:ATrPS_freq,`Jitter->F0_abs_dif`:RPDE)
testing  <- notna[-trainIndex[,1],] %>%
  select(RC,FCoM_envel:ATrPS_freq,`Jitter->F0_abs_dif`:RPDE)

fitControl <- trainControl(## 10-fold CV
  method = "CV",
  number = 10,
  allowParallel=TRUE,
  savePredictions="final",
  summaryFunction=twoClassSummary)

vtCVFit <- train(x=training[-1],y=training[,"RC"], 
                  method = "glmnet", 
                  trControl = fitControl,
                  preProcess=c("center", "scale"),
                  metric="Kappa"
)

我找不到任何明显错误的数据。没有NA

table(is.na(training))

FALSE 
43166

，不知道为什么它会尝试在列数之外进行索引。

有什么建议吗？

Answer 1

您必须在trainControl（）中删除summaryFunction = twoClassSummary。它对我有用。

fitControl <- trainControl(## 10-fold CV
 method = "CV",
 number = 10,
 allowParallel=TRUE,
 savePredictions="final")

vtCVFit <- train(x=training[-1],y=training[,"RC"], 
method = "glmnet", 
 trControl = fitControl,
preProcess=c("center", "scale"),
metric="Kappa")

 print(vtCVFit)

#glmnet 

#113 samples
#381 predictors
#  2 classes: 'NVT', 'VT' 

#Pre-processing: centered (381), scaled (381) 
#Resampling: Bootstrapped (25 reps) 
#Summary of sample sizes: 113, 113, 113, 113, 113, 113, ... 
#Resampling results across tuning parameters:

#  alpha  lambda      Accuracy   Kappa    
#  0.10   0.01113752  0.5778182  0.1428393
#  0.10   0.03521993  0.5778182  0.1428393
#  0.10   0.11137520  0.5778182  0.1428393
#  0.55   0.01113752  0.5778182  0.1428393
#  0.55   0.03521993  0.5748248  0.1407333
#  0.55   0.11137520  0.5749980  0.1136131
#  1.00   0.01113752  0.5815391  0.1531280
#  1.00   0.03521993  0.5800217  0.1361240
#  1.00   0.11137520  0.5939621  0.1158007

#Kappa was used to select the optimal model using the largest value.
#The final values used for the model were alpha = 1 and lambda = 0.01113752.

Answer 2

通过以下代码将您的因素更改为字符，并查看其是否有效：

      training <- data.frame(lapply(training , as.character), stringsAsFactors=FALSE)

我会把这个建议留为评论，但我却做不到（因为我的声誉少于50！）

使用插入符号训练套索模型时，列不可用

2 个答案: