短語詞組短語linear unbiased minimum variance 線性無偏最小方差unbiased minimum variance estimation 無偏最小方差估計unbiased minimum variance 無偏最小方差unbiased posterior variance 無偏驗后方差unbiased minimum variance estimate 無偏最小方差估計linear unbiased minimum variance estimates 線性無偏最小方差估計linear unbiased minimum variance estimate 線性無偏最小方差估計 返回 unbiased variance