g c=1
n mata
v=st_matrix("v")
v=v+v'-diag(diagonal(v))
y=st_data(.,"y")
x=st_data(.,"x* c")
sigma2=invsym(x'*invsym(v)*x)
b=sigma2*x'*invsym(v)*y
se=sqrt(diagonal(sigma2))
(b,se,b:/se,2*normal(-abs(b:/se)),b-invnormal(0.975)*se,b-invnormal(0.025)*se)
end