Amy Peterson

In [Longitudinal Analysis in R](https://www.datacamp.com/courses/longitudinal-analysis-in-r), in exercises with models that are S4 objects, `check_arg("formula")` does not flag incorrect formulas and the SCT passes with an incorrect entry. [Here](https://campus.datacamp.com/courses/longitudinal-analysis-in-r/modeling-longitudinal-dichotomous-outcomes?ex=3) is an...

@yashasroy @richierocks In Chapter 4 "Sorting multiple columns" ex 5 (https://campus.datacamp.com/courses/intro-to-sql-for-data-science/sorting-grouping-and-joins?ex=5), sub-exercises 1 and 4 refer to the people table, while exercise 2 and 3 refer to the films table....