However,From(10.9)-(10.14) Ea}=2c-} m 2 m-1o2 m m lim EG2)-1 lim m-lo2=g2 m→0 m The sample variance is biased but asymptotically unbiased estimate. UESTC 1010 UESTC However, From(10.9)-(10.14) The sample variance is biased but asymptotically unbiased estimate.   ( )  2 2 2 1 2 2 2 1 ˆ 1 m i i E E m m m m m       = = − − − = − =  y   2 2 2 1 lim lim ˆ m m m E m    → → − = =