I may have missed something but what is your date ? Where can we found data$Challenge
?
Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.
I may have missed something but what is your date ? Where can we found data$Challenge
?
Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.