阳同学2022-05-27 20:55:34
What is the difference between efficient, unbiased, consistent and best?
查看试题回答(1)
姚奕2022-05-28 20:17:05
unbiased是指: a statistic which has an expected value equal to the population volatility(构造的样本量的均值正好等于总体的参数)
consistent是指:increasing his sample size will decrease the sampling error for this statistic.(增加样本个数,就能降低样本估计的误差)
efficent是指:在所有无偏估计量中,这个估计的方差最小。
best是:在所有线性无偏估计量中,这个估计的方差最小。所以efficent一定是best的,反之不然。
- 评论(0)
- 追问(0)
评论
0/1000
追答
0/1000
+上传图片
