Questions In Machine learning

How To Fix Error In Confusion Matrix: The Data And Reference Factors Must Have The Same Number Of Levels?

Hello, While I’m working on R caret Linear Regression model. I’m trying to execute a confusion matrix and then I’m getting this below:

Error in confusionMatrix.default(pred, testing$Final): the data and reference factors must have the same number of levels.

Can anyone tell me What does it mean, Why this error occurs, and How to fix this error?



29th June 2020


Speak with a Learning Advisor

Understand how the industry and practically oriented courses at Mindmajix transform your career.

  • Explore the trending and niche courses and learning maps
  • Learn about tuition fee, payment plans, and scholarships
  • Get access to webinars and self-paced learning videos