Extension of LS-weighted LS Weighted LS J(0)=(x-H0)Tw(x-H0) whxiong@uestc.edu.cn 18whxiong@uestc.edu.cn Weighted LS Extension of LS—weighted LS 18 J(µ) = (x ¡ Hµ) T w(x ¡ Hµ)