A dataset of a class contains a variable that shows the school year of a student: freshman, sophomore, junior, or senior. You want to code the variable 1-4 by number of students in the group (from...

Extracted text: A dataset of a class contains a variable that shows the school year of a student: freshman, sophomore, junior, or senior. You want to code the variable 1-4 by number of students in the group (from more to less). The dataset is currently ordered by student names alphabetically, show the steps of making the new variable.