How to group data in STATA with SORT and BY

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Disclaimer: I used to work with Stata and sell this course online for US$19. Since I no longer work with Stata and will not update the course, I decided to help others by making the course available for free. If you enjoyed it, please leave your comment - I am always happy to know I could help someone out with my work :)
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Thank you and happy Learning!
Lucas Reis

[@abcdxyz1100]

Thank you for the very simple and clear instructions and commands.

[@ishararatnayaka479]

Thank you

[@raulcruzquintanilla9834]

Many thanks sir very helpful video!

[@uclalse]

So good! Thank you!

[@souzalucasr]

You're welcome

[@pwnisherino7414]

Thank you so much!

[@souzalucasr]

You're welcome, Tom! Thank you for leaving a comment :)

[@nondumisondhlovu9181]

Is it necessary to first sort the data before applying "by" because I always run "by variable, sort : command" and achieves the same outcome?

[@adorationchigere6877]

I need assistance, please. I have a panel data of everyone that come for refill of their medications monthly. I also have longitudinal data that captures the first time they visited the facility for their medication. Now, i would like to differentiate, and calculate the total number of monthly initiations from refills. How can i do this on STATA please?

[@victorcoronel6181]

How can I group clustered variables hierarchically ordered?

[@animeshchowdhury448]

Sir,
I am currently working on a meta analysis. But I am not able to produce association studies of allele contrast (A vs a). Except that all are done but can not understand how to calculate A vs a frequency. If you help me out it will help me a lot.
Thanks