Inquiry Regarding response and predictors in the trainModel Function

[dmresearch15]

Hello,

I am currently working through the classification problem presented in the introduction.Rmd vignette and have a question regarding the trainModel function.

I would like to clarify how the response variable and predictor variables are defined when the function is called as reference <- trainModel(reference).

Could you please explain what data or object types the response and predictors slots expect in this context?

Thank you for your time and assistance.