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(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料

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(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(55)-第七章_参数估计空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料

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2025第七章 参数估计第二部分、题型解析 题型一、点估计(★★★★) 一、点估计的定义 设是总体分布中的未知参数, 为估计, 需构造一 个适当的统计量 ˆ ( X 1 , X 2 , , X n ) ,  然后用其观察值 ˆ ( x 1 , x 2 , , x n )  来估计 的值.称 ˆ ( X 1 , X 2 , , X n ) ˆ  为的估计量. 称( x , x , , x )为的估计值. 1 2 n 估计量与估计值统称为点估计.二、矩估计 矩估计的基本思想是用样本矩去近似相应的总体矩.具体步 骤如下: 第一步、求出总体一阶原点矩EX ,一般其结果中含有未知参数. 1 n  第二步、求出样本的一阶原点矩 X = X . i n i=1 第三步、令 E X = X ,若解出参数 ˆ 则估计完毕;若还未解出,继续下 一步. 第四步、 再计算总体和样本的二阶原点矩 E X 2 和 1 n  i n = 1 X 2 i , 并令两者相 等求解未知参数.三、极大似然估计 1.思想: 寻找使当前结果出现的可能性最大的那个作为未知参数的 估计. 2.极大似然估计的方法 第一步、求出似然函数 L ( )  ,其表示出现当前样本值 x 1 , x 2 , , x n 的可 能性的大小. 离散型总体: L ( ) P { X 1 x 1 , X 2 x 2 , , X n x n } P { X 1 x 1 } P { X 2 x 2 } P { X n x n }  = = = = = = = = 连续型总体: n  L() = f ( x , x , , x ) = f ( x ,) f ( x ,) f ( x ,) = f ( x ,). 1 2 n 1 2 n i i=1第二步、求出使 L ( )  取最大值的,作为未知参数的估计量. (1)取自然对数 l n L ( )  ; (2)求似然方程 d l n d L ( ) 0   = ; (3)若求解似然方程得到参数,即为极大似然估计量. 若似然方程无 解,即 d l n d L ( ) 0    (或  0 )恒成立,则 L ( )  单增(或单减),则取的最 大值(最小值)作为极大似然估计量.解题思路:根据题目要求,按照矩估计与极大似然估计的解题方法来 解题,套路比较固定.【例 7.1】设总体 X 的密度函数为 f ( x ) ( 0 , 1 ) x , 0 x 1   =  +  其 他  ,其中 1   − 是未知参数, X 1 , X 2 , … , X n 是来自总体 X 的简单随机样本,分别 用矩估计法和极大似然估计法求的估计量.【例 7.2】某人做独立重复射击,每次击中目标的概率为 p ,直到第 X 次射击才击中.现取简单随机样本( X 1 , X 2 , X n ),求参数 p 的矩估计和 最大似然估计.【例 7.3】设 X 1 , X 2 , , X n 是取自总体 X 一个简单随机样本, X 的概率 密度为 f ( x ) x 0 l n , , x x 0 0 , , ( 0 1 )    =  −     (1)求未知参数的矩估计 量;(2)求未知参数的最大似然估计量.【例 7.4】设总体 X 的概率密度函数为 f ( x , ) 2 1 e x / , ( x )    = − −    +  ,其中   . X 1 , X 2 , , X n 是总体 X 的 一个容量为 n 的样本.(1)求参数的矩估计量;(2)求参数的最大似然估计量;(3)说明由最大似然估计法所得的估计量是否为无偏估计量.【例 7.5】设总体 X  1 , x  1,  ( ) 的概率密度为 f x, = 1 − 其中为未  0, 其它,  知参数, X 1 , X 2 , . . . , X n 为来自该总体的简单随机样本. (1) 求的矩估计量;(2) 求的最大似然估计量.题型二、估计量的评价标准(仅数一) (★★) 1. 无偏性 若 E ( )    =,则称 为的无偏估计量. 2. 有效性 设 1   和 2   都为的无偏估计量,但 D ( ˆ 1 ) D ( ˆ 2 )    ,则称 1   是 比 2   更有效.  3. 一致性 设 为的估计量,如果对于任意的正数,都有 n ln i m P ( | n | ) 0 ,    →   −  = 或 ln i m P ( | n | ) 1    →   −  =  ,则称 为的一致估计 n 量(或相合估计量).解题思路:此类问题一般用估计量评选标准的定义进行求解,在历年 真题中无偏性的考查是最多的. 另外需要注意: 1.EX = EX , ES2 = DX ,即样本均值,样本方差分别是总体期望和总体 方差的无偏估计. 2.样本的 k 阶原点矩是总体 k 阶原点矩的一致估计.【例 7.6】已知总体 X 服从参数为的泊松公布, X 1 , X 2 , , X n 是取自 总体 X 的简单随机样本,其均值为 X ,方差为S2 ,如果 ˆ a X ( 2 3 a ) S 2   = + − 是 的无偏估计,则a= .【例 7.7】设总体 X 为 [ , 2 ]   (为未知参数)上的均匀分布,从总体 中取样本 X 1 , X 2 , , X n . 证明: ˆ 2 3 X  = 是的无偏估计和一致估计.【例 7.8】设 X 1 , X 2 , X 3 , X 4 为总体 X 的样本,则总体均值的最有效的估 计量为( ). 1 1 1 1 (A) X + X + X + X (B) 1 2 3 4 3 6 3 6 1 2 X 1 + 1 3 X 2 + 1 1 2 X 3 + 1 1 2 X 4 1 1 1 7 1 1 1 1 (C) X + X + X + X (D) X + X + X + X 1 2 3 4 1 2 3 4 3 6 9 18 4 4 4 4强化阶段结课啦! 不是 开始 这 结束!而是一个新的 ! 还要继续加油,继续自律,继续努力 拒绝拖延! 少玩手机! 规律作息! 多做练习! 同学们我们真题阶段见!
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  1. CONNECT:[ UseTime:0.000622s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000846s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000615s ]
  6. SELECT * FROM `set` [ RunTime:0.000249s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000714s ]
  8. SELECT * FROM `wendang` WHERE `id` = 327460 LIMIT 1 [ RunTime:0.000494s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 327460 [ RunTime:0.003489s ]
  10. UPDATE `wendang` SET `lasttime` = 1772093516 WHERE `id` = 327460 [ RunTime:0.000550s ]
  11. SELECT * FROM `wendang` WHERE `id` < 327460 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000596s ]
  12. SELECT * FROM `wendang` WHERE `id` > 327460 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000599s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 327460 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001082s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 327460 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001681s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 327460 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001749s ]
0.087729s