I want to sum the column 'stat1' by the column 'Group' if it has a certain value, such as Group == 'AAA'


Group sub-group code Name stat1 stat2 stat3
AAA AA wsed A 2 5 20
gfb B 54 43 22
BB wewe C 33 43 35
qsq D 4 20 43
BBB CC nhn K 54 43 22
asa L 4 8 8
DD dsd A 67 8 2
ss B 56 7 45


In non stata-syntax, I m looking for some command on the following lines:

Do sum of all corresponding values in column stat1 when value of Group == "AAA"

I would appreciate if some Stata user can help