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Hi,
I am using STATA 18 but is not running like before version and have problem
I need the difference between coefficients of first and third level of categorical variable

Income 1a. - 3.a

Last version was runnin good bt now i see the help tool but i don understaning yet ...

some one can help?

If you are still encountering this problem could you please provide examples of syntax that worked previously and is now causing problems?