Why some global parameter is in { } while the others are not?

[Lucrecia Lei]

Dear all,

I'm helping my prof modify past code to adjust to the new dataset. It is my first time using globle parameter to navigate through files. I have a separate dofile for all global parameters, and inside there is this global parameter:

global weight_var                                 weight_worker

And in my statistic calculating do file, when use this parameter, it write

keep $wage_definition_ts ${weight_var} $gender_groups

, while you can see all other global parameters are not in { }.
I want to ask what is the difference if I put it in {} and not?

Thanks!

[Lucrecia Lei]

Sorry I change my search and find the answer in this question:
https://www.statalist.org/forums/for...ocal-in-global