回答(1)
爱吃草莓的葡萄2023-11-16 17:09:21
同学你好。无偏(unbiasedness)、有效(efficiency)、一致(consistency)是估计量的三个特点。
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.即样本统计量等于总体参数;
2)Efficiency refers to how close the sample estimates are to the population parameter being estimated.即在所有无偏估计量中,方差最小;
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.即随着样本量的增加,样本统计量逐渐靠向总体参数,或者说估计越来越准确。
- 评论(0)
- 追问(0)


评论
0/1000
追答
0/1000
+上传图片