sysuse auto,clear

qui reg price wei len

mat b = e(b)

mat vv = b'*b

. mat list vv

symmetric vv[3,3]
            weight      length       _cons
weight   22.081211
length  -460.32186   9596.2227
 _cons   48807.028  -1017468.8   1.079e+08

[此贴子已经被作者于2008-5-8 19:51:10编辑过]