confusion matrix of bstTree predictions, Error: 'The data must contain some levels that overlap the reference.'?

I am trying to train a model using bstTree method and print out the confusion matrix. adverse_effects is my class at...

R package caret confusionMatrix with missing categories?

I am using the function confusionMatrix in the R package caret to calculate some statistics for some data I have. I...

How to calculate classification error rate?

Alright. Now this question is pretty hard. I am going to give you an example. Now the left numbers are my algorithm...

How do I convert confusion matrix in a data frame in python??

I would like to know how to transform a confusion matrix from scikit learn in a dataframe. How can I do that ? I ...