caret train method not working (something is wrong for all accuracy results) for outcomes with >2 categories

Question

Hi I know someone asked similar issues before but no clear answer yet (or I tried their solution without success: Caret error using GBM, but not without caret Caret train method

Answer 1

Thank howaj for your post. That did work for the data I posted but somehow did not work for another dataset, where everything seems to be the same. But I figured out finally:

Could be a syntax issue here. Instead of using train(y~., data=training, ...), I changed to the train(train$y,train$x, ...) without specifying data=.. explicitly:

train(training[,!names(training)%in%response], training$response ...)

This worked.