10.5.1 Unbiased estimates An estimate a(y)is unbiased,if Ea-a is a constant vector E{a=E{a}-n。 is a random vector Asymptotically unbiased estimate lim=F)- UESTC 8An estimate is unbiased, if 8 UESTC 10.5.1 Unbiased estimates ( ) ˆ  y       ˆ is a constant vector ˆ E = is a random vector         = =   Asymptotically unbiased estimate     ˆ lim = m    E  →  =