did you mean to say flag or lag in the exercise?

exercise 11says:
Write code that adds a variable to the data frame data that lags V4
# with 1 value. Important: the first value of each ID should be NA.

my question is:
is "lag" a typo?

Answers and follow-up questions

Answer or follow-up question 1

It's definitely lag. I've updated the exercise with more explanations.

Michel Ballings

Sign in to be able to add an answer or mark this question as resolved.