Stata - How to generate new variables, use egen to add variables, find a variable mean, and 2x2table

Описание: Here is a link to the complete playlist I have on Stata:
   • Introduction to Stata  

Here is the link to the data on Kaggle's website:
https://www.kaggle.com/datasets/jonia...

Here is my code for this video:
https://drive.google.com/file/d/1KJzx...

Here is the .dta data:
https://drive.google.com/file/d/18Ip7...