推 ajarist:thx u very much! 05/11 03:01
assume u have four subject: ge gm us west. 19 years :1935~1954
ur date should look like
sub t x1 x2
ge 1935 32 3
ge 1936 65 23
. . . .
. . . .
ge 1954 65 34
gm 1935 8 98
gm 1936 7 8
. . . .
. . . .
west 1954 94 43
command
iis sub
tis t
xtreg....
good luck
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