unbiased estimator的用法和樣例：
例句
- Unbiased estimators are not necessarily consistent, but those whose variances shrink to zero as the sample size grows are consistent.
無偏估計量未必是一致的，但是那些當樣本容量增大時方差會收縮到零的無偏估計量是一致的。 - Futures price is the unbiased estimate of expected spot price, which is based on the function of risk transferring.
期貨價格是未來現貨價格的無偏估計，這是建立在風險轉移功能基礎之上的。
