Dear friends, I have some knowledge on standardisation, but I still have doubts; I would like to understand better. I have a analysis and the database has 7 continuous variables. The variables were standardised and now have a normal distribution: I have looked the histogram, skeness = 0, kurtosis = 3), with values from negative to positive numbers, and the standard desviation ~ 2.0. My doubts are:
1) why to create variables with sd ~2.0?
2) How to do that in Stata (commands)?
3) the interpretation is the same if the formula "(y-mean)/sd" were applied?
4) Could you give me a reference to read?
I am using Stata version 14.2.
Thank you,
Sergio