[R] contrasts can be applied only to factors with 2 or more levels

[Patrick (Malone Quantitative)]

Seems self-explanatory. It sounds like one of your predictors has no
variability.

On Fri, Dec 20, 2019 at 3:01 PM javed khan <javedbtk111 using gmail.com> wrote:
>
> I am using the folowing code and it give me the error message like
>
> " contrasts can be applied only to factors with 2 or more levels".
>
> What could be the problem
>
> d=read.csv("Result.csv")
> index <- createDataPartition(log10(d$Results), p = .70,list = FALSE)
> tr <- d[index, ]
> ts <- d[-index, ]
> index_2 <- createFolds(log10(tr$Results), returnTrain = TRUE, list = TRUE)
> ctrl <- trainControl(method = "cv", index = index_2)
>
> set.seed(30218)
>
> grid_search <- train(log10(Results) ~ ., data = tr,
>                      method = "svmRadial",
>
>                      tuneLength = 8,
>                      metric = "MAE",
>                      preProc = c("center", "scale", "zv"),
>                      trControl = ctrl)
>
>         [[alternative HTML version deleted]]
>
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