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2023-11-16 15:11老師可以展開(kāi)中英文解釋一下無(wú)偏性、有效性和一致性嗎
所屬:CFA Level I > Quantitative Methods 視頻位置 相關(guān)試題
來(lái)源: 視頻位置 相關(guān)試題
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愛(ài)吃草莓的葡萄助教
2023-11-16 17:09
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同學(xué)你好。無(wú)偏(unbiasedness)、有效(efficiency)、一致(consistency)是估計(jì)量的三個(gè)特點(diǎn)。
1) Unbiasedness refers to the property of an estimator that ensures that it provides an expected estimate that equals the true parameter value being estimated.即樣本統(tǒng)計(jì)量等于總體參數(shù);
2)Efficiency refers to how close the sample estimates are to the population parameter being estimated.即在所有無(wú)偏估計(jì)量中,方差最??;
3)Consistency refers to the property of an estimator that ensures that as the sample size increases, the estimate converges to the true population parameter being estimated.即隨著樣本量的增加,樣本統(tǒng)計(jì)量逐漸靠向總體參數(shù),或者說(shuō)估計(jì)越來(lái)越準(zhǔn)確。
