st: difference with decomp decompose oaxaca

[ncdcta00@uniroma2.it]

Dear statalist,
I have some confusion about the commands for aoxaca:
is the same if I use decom, decompose and oaxaca?
If I foud that unexplaneid ( U: discrimitation) is negative what is it  
means? that I don't have discrimation?
my high mod is men and low mod is female.
Thanks a lot for your help




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