@Yadav1, Welcome to the SAS Communities 🙂
The questions you have posted can be answered by a simple Google search.
If you want good answers in the community, please ask good questions and show us that you made an effort yourself.
You'll learn a lot faster by reading SAS's documentation on DATA step processing. For example:
I combined all your one-line questions into one, as the answers are the same for all:
Are you ready for the spotlight? We're accepting content ideas for SAS Innovate 2025 to be held May 6-9 in Orlando, FL. The call is open until September 25. Read more here about why you should contribute and what is in it for you!
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.