How to Fix in R: Contrasts can be applied only to factors with 2 or . . . In this article, we will discuss how we can fix "contrasts can be applied only to factors with 2 or more levels" error in the R programming language It is a common error produced by the R compiler The complete form of this error is given below:
How to Fix: contrasts can be applied only to factors with 2 or more levels This error occurs when you attempt to fit a regression model using a predictor variable that is either a factor or character and only has one unique value This tutorial shares the exact steps you can use to troubleshoot this error
Error in `contrasts lt;-`(`*tmp*`, value = contr. funs[1 + isOF[nn]] I have read that you can get this error if your variables have less that 2 levels or have NA's But I have double checked and this is not an issue It seems to be related to the "Diet" variable as I can run the code if I remove it Does anyone know why this is?
XgBoost error: contrasts can be applied only to factors with 2 or more . . . No error occurs after changing to -1 but the dgcMatrix that is generated looks suspicious as it contains just one column and lot of rows I was expecting the columns of the original matrix to be one-hot encoded rather than getting one columns as an output