CODEWITHSUNDEEP
rr-caret
AlirezaTafazzol
AlirezaTafazzol

Reputation: 39

"train" function Error in "caret" package R: "Please use column names for `x`"

I am trying to use train function for Leave-One-Out (LOO) cross validation (LOOCV).

While

train(y~ x1, data = test, method="lm", trControl = trainControl(method = "LOOCV"))

works well, I need to write it in another format that I can put it in a for loop that I make as many as models that I want. But the following format does not work and give an error:

train(paste("y~", colnames(test[2])), data = test, method="lm", trControl = trainControl(method = "LOOCV"))
Error: Please use column names for x

But the same format in "lm" function works well:

lm(paste("y~", colnames(test[2])), data = test)

Can you please guide me how to fix this issue?

Upvotes: 1

Views: 1332

Answers (1)

AlirezaTafazzol
AlirezaTafazzol

Reputation: 39

Found the solution!

lm("y~x1", data=test)

works as same as

lm (y~x1, data=test)

But "y~x1" does not work in the train function. Need to add 'as.formula' before it:

train(as.formula("y~x", data=test, method="lm", trControl = trainControl(method = "LOOCV"))

Upvotes: 2

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