l*******d
发帖数: 101 | 1 I also don't find completeness very intuitive, although it is quite useful.
Sufficiency + completeness => minimal sufficiency.
Two major theorems relying on completeness:
1. Basu's theorem: Complete sufficient statistics are independent of
ancillary statistics.
E.g. can be used to show that sample mean and sample variance of a Normal (\
mu, \sigma^2) are independent of each other.
2. Lehmann-Scheffe theorem (see ningyan's reply): Unbiased estimators based
on complete sufficient statistics are u |
|
发帖数: 1 | 2 【 以下文字转载自 Immigration 讨论区 】
发信人: blinkfein (GS), 信区: Immigration
标 题: 485 体检不 "sufficient",会是什么原因？同时还要两张照片
发信站: BBS 未名空间站 (Sat Nov 25 14:56:17 2017, 美东)
2017.4 的 RD, 1A, TSC.
六月份 RFE 140 要 work plan.
10.18 转 local office
昨天收到notice，说 i-693 没交或者不够sufficient，需要update。
(同时还要两张照片..)
体检是今年2-3月份
指纹5月份打过
请教一下，这种要求有经验丰富的大牛见过没？应该怎样处理？
（notice说目前不需要寄东西，如果要面试要把update 的 i-693带上，否则等指示寄
到什么地址） |
|
d********2
发帖数: 44 | 3 You are in Lincoln Memorial --sufficient but not necessary--> you are in
Washington DC
(b/c Lincoln Memorial is in Washingto DC; but you can be in White House to
be in Washington)
You are in Washington DC --necessary but not sufficient--> you are in
Lincoln Memorial
(same reason as above) |
|
s*******1
发帖数: 135 | 4 Let me try this.
I would like to marry a person who is rich.
A person is rich--necessary but not suffcient -- I will get married with him.
I get married with someone--sufficient not necessary--the person is rich.
I must marry a person who is rich
I get married with someone--sufficient and necessary--the person is rich |
|
a***n
发帖数: 40 | 5 【 以下文字转载自 Statistics 讨论区 】
发信人: alvin (al), 信区: Statistics
标 题: minimal sufficient statistic
发信站: BBS 未名空间站 (Fri Dec 22 12:01:53 2006)
for double exponential distribution, f(x)=exp{-|x|}/2, why the minimal
sufficient statistic is the order statistic, instead of (sum over |Xi|)??
Thanks. |
|
g********5
发帖数: 62 | 6 since you already give the parameters of the distribution, there is no such
thing as minimal sufficient statistics here, if have to say one, then any
constant is.
I guess you misunderstand the problem itself.
Say, if X1..Xn are iid with density f(x)=exp{ - |x-mu|/beta} /(2*beta)
(In general, this is the density for double expontential distribution)
Then the minimal sufficient stat is the order stat. |
|
n*****n
发帖数: 3123 | 7 completeness应该没有sufficent, minimal这样的可以理解的意义。rao-blackwell 说
明如何找better estimator. if T' is an unbiased estimator of theta, and T is
a sufficient statistic, E(T'|T) is a better estimator than T'. While if T is
a complete sufficient statistic, E(T'|T) is the UMVUE by Lehmann-scheff. |
|
f*******m
发帖数: 94 | 8 非常感谢 ningyan 和 leftfield 的解释，现在清楚多了。
不过Rao-blackwell 和 Lehmann—scheffe 两个定理很容易搞混。虽然前者是建立在
sufficient 的基础上，后者是建立在 complete sufficient基础上的，但是都是用来
找UMVUE的。 |
|
a***r
发帖数: 420 | 9 除了shifted exponential, normal, unif(theta-a,theta+a)这些例外，
绝大部分都是order statistics？
做到一个作业：
location family distribution with p(x;theta)=f(x-theta),
where f(x)=q(x)*exp(-x^2/2)
q(x) 是x的一个非常非负的多项式.
那么对于从这个分布sample出来的iid X1...Xn
minimal sufficient statistics 是order statistics么？
我用Casella上的Theorem 6.2.13，看起来要使
product_(Xi-theta)/product_(Xi-theta) (1)
以及
(sum_Xi - sum_Yi)* theta (2)
都independent of theta；
(1)需要order statistics
(2)只需要sum_X，但只要知道order statistics, 就知道sum_X了
所以minimal sufficient statist... 阅读全帖 |
|
|
|
d*******a
发帖数: 545 | 12 其实也不多，才14.4刀，以前两三百刀的支票也没有什么关系。
前天存的，昨天就看到帐户里有一个Pending的Charge，和存的支票金额一样。就发信
去问了，一会儿就回复了，说是"I have reviewed the account and show that this
item is being returned for non sufficient funds"
今天早上起来看到还多了12刀的Return Fee。
给Shopper发信了，不知道什么原因。
支票是这个月11号Issue的，21号收到，22号存。。。。。 |
|
s**********g
发帖数: 14942 | 13 伤敌一百
自损十万
7年内就算开两张信用卡，bonus都是几倍的non sufficient fee |
|
b*******r
发帖数: 432 | 14 【 以下文字转载自 Overseas 讨论区,原文如下 】
发信人: toughguy (呜哩呜噜), 信区: Overseas
标 题: Re: How much will be sufficient to apply for F-2 visa
发信站: The unknown SPACE (Sat Jan 29 00:25:19 2000), 站内信件
有一个大概算法，对于I20表上的收入和支出比较。请到国内清华BBS的出国板里看看，
刚有一个叫zzzf的拿到F2签证，TA讲了一下其I20表的情况。另外就是银行的流水帐。 |
|
b*******r
发帖数: 432 | 15 【 以下文字转载自 Overseas 讨论区,原文如下 】
发信人: fiant (虫虫), 信区: Overseas
标 题: Re: How much will be sufficient to apply for F-2 visa
发信站: The unknown SPACE (Sat Jan 29 00:44:36 2000) WWW-POST
偶当时的8b-7all=1540，老公提供了5000刀的银行存款，但签证时签证官只看了偶的20表，
存款根本没有用上，但是准备好了以备万一。 |
|
f**********h
发帖数: 280 | 16 Hello,
USCIS received sufficient number of H1B Visa petitions for FY 2011 as of Jan
26, 2011.
Click here for more details.
Stay tuned for additional information.
-HSB. |
|
发帖数: 1 | 17 2017.4 的 RD, 1A, TSC.
六月份 RFE 140 要 work plan.
10.18 转 local office
昨天收到notice，说 i-693 没交或者不够sufficient，需要update。
(同时还要两张照片..)
体检是今年2-3月份
指纹5月份打过
请教一下，这种要求有经验丰富的大牛见过没？应该怎样处理？
（notice说目前不需要寄东西，如果要面试要把update 的 i-693带上，否则等指示寄
到什么地址） |
|
o*********e
发帖数: 2452 | 18 跟老板同事们出去吃饭，吃到后来俺说了句"i am full,"结果被老板纠正说应该说“I
had my sufficiency，”说这是礼貌的说法。
从来木右听说过这句话。还有，说I am full很不礼貌么？ |
|
s*******1
发帖数: 135 | 19 大家是怎么理解necessary condition and sufficient condition, 我对这俩个重要的
概念胡度得连例子都举不出来. |
|
s*******1
发帖数: 135 | 20 People have leisure when resources are plentiful.
People have leisure sounds sufficient condition here. But some book said
when=if. 请各位大侠赐教。 |
|
f*******m
发帖数: 94 | 21 在看书的时候，觉得 sufficient还是可以理解的，可是很难理解那个 Rao-Blackwell
theorem，不知道如何应该这个theorem. 然后觉得那个completeness 虽然定义很简单
，但是不知道如何理解。还有这个completeness在统计中一般应用在哪里呢？
希望知道的能指点一二，非常感谢！ |
|
i****w
发帖数: 329 | 22 I found the informaiton is very uselful, while preparing for my RFE response
to Eb1a petition.
The original document link is as follows:
http://imminfo.com/Library/green_cards/EB/extraordinary_ability
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
The USCIS Adjudicator's Field Manual provides the following guidance to
center adjudicators:
(i) Special Considerations Relating to EB-1 Cases.
Certain alien beneficiaries are exempted from the labor certification
application process by virtue of their e... 阅读全帖 |
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x*****g
发帖数: 87 | 23 Data Sufficiency Question:
100个产品里有次品,抽出不放回,问第5次抽出来的是不合格产品的几率
1) 每25个产品里至少有1个次品
2) 首4次抽出来的产品至少有1个次品
(A)statement (1) ALONE is sufficient, but statement (2) alone is not
sufficient to answer the question asked;
(B)statement (2) ALONE is sufficient, but statement (1) alone is not
sufficient to answer the question asked;
(C)BOTH statements (1) and (2) TOGETHER are sufficient to answer the
question asked, but NEITHER statement ALONE is sufficient;
(D)EACH statement ALONE is sufficient to answer the |
|
f**d
发帖数: 768 | 24 这是一本计算神经科学的优秀著作，全文拷贝这里（图和公式缺），有兴趣的同学可以
阅读
如需要，我可以分享PDF文件（－－仅供个人学习，无商业用途）
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖 |
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n********n
发帖数: 8336 | 25 Free Will and Determinism
http://www.trinity.edu/cbrown/intro/free_will.html
This is a quick look at issues concerning the nature of free agency. There
are three important questions about free will and determinism, but only one
of them is really a philosophical question. Ayer mentions all three
questions in his opening paragraph (Bailey, p. 558): "It is commonly assumed
that men are capable of acting freely, in the sense that is required to
make them morally responsible, and that human behavior ... 阅读全帖 |
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c********n
发帖数: 225 | 26 实验流程第三步：
3.Genomic DNA extraction
更新前
3-1 48-60 hours after transfection, cells are harvested by trypsin digestion
. Four wells of cells are combined into a 1.5 ml EP tube.
3-2 For genomic DNA extraction, 500 μl of cell lysate buffer (50 mM Tris，
100 mM EDTA，0.5% SDS，pH 8) and 10 μl proteinase K (10 mg/ml）are added
into each tube and mixed gently and sufficiently. Bathe the tubes at 55℃
for 2 hours.
3-3 200 μl Tris-Phenol and 200 ul trichloromethane are added into each tube
and mixed gently and ... 阅读全帖 |
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c******t
发帖数: 1733 | 27 篮球我是外行，但我想所有对抗性运动的基本道理都是一样的。运动场的performance
提高，离不开身体素质训练，包括力量，爆发力，耐力，平衡力等等，而且这些能力还
必须在对抗的情况下能表现出来。我对训练的几点心得
1。高强度训练， 但要适可而止。 多做HIIT
2。训练中身体work as a unit,
3。core strength 及其重要
4。一定要读理论，了解身体
贴几篇文章给你读一下，希望对你有些帮助
Supper stiffness
At a gymnastics or martial arts meet, or at a weightlifting competition,
listen to the coaches advice to the athlete – Stay tight! This means to
maintain stiffness. Being stiff ensures that there will be minimal energy
losses as forces are transmitted through the linkages.... 阅读全帖 |
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R*o
发帖数: 3781 | 28 By Dave Hunt
The Growing Controversy
The Counter-Remonstrance was in turn answered by The Opinion of the Remonstr
ants. This was a far more lengthy document which went into great detail to e
stablish what the Remonstrants "in conscience have thus far considered and s
till consider to be in harmony with the Word of God . . . ." It contained le
ngthy objections to Calvinism under four headings, the main points of which
are summarized in the following excerpts:
From Section I (10 paragraphs):
3. Go... 阅读全帖 |
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z*t
发帖数: 863 | 29 Beutler得奖，Medzhitov会不会有意见？
http://www.sciencedirect.com/science/article/pii/S1074761309002
Ruslan Medzhitov
This year marks the 20th anniversary of a publication (Janeway, 1989) that
in many ways revolutionized our understanding of the immune system. As part
of the proceedings of the Cold Spring Harbor Symposium on Immune Recognition
, the paper authored by the late Charles A. Janeway, Jr. was not a standard
peer-reviewed publication. In fact, Charlie used to refer to it as “the
best paper I've ... 阅读全帖 |
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I*****a
发帖数: 5425 | 30 So
1) Do we use the concept "sufficient" when we are talking about a statistic
? I personally never saw terms like "sufficient likelihood" or "a likelihood
function is sufficient", etc. I even tried to google it and you may try it,
too.
2) Is a likelihood function a function of parameters ? No one says a sample
{Xi} cannot fully specify a likelihood function. But this does not change th
e fact that "likelihood function is a function of parameters"
I think these two are the results everyone can c... 阅读全帖 |
|
e****i
发帖数: 2152 | 31 【 以下文字转载自 Military 讨论区 】
发信人: erkuai (三天不上bbs,赶得上刘少奇), 信区: Military
标 题: On the Jews and Their Lies, 1543
发信站: BBS 未名空间站 (Wed Jan 12 23:21:23 2011, 美东)
by Martin Luther (1483-1546)
Translated by Martin H. Bertram
copyright © 1971 Fortress Press & Augsburg Fortress - On the Jews and
Their Lies is from Luther’s Works Volume 47. Augsburg Fortress is the
publishing ministry of the Evangelical Lutheran Church in America.
Funded through sales revenue, Augsburg Fortress is called to provide
produ... 阅读全帖 |
|
e****i
发帖数: 2152 | 32 by Martin Luther (1483-1546)
Translated by Martin H. Bertram
copyright © 1971 Fortress Press & Augsburg Fortress - On the Jews and
Their Lies is from Luther’s Works Volume 47. Augsburg Fortress is the
publishing ministry of the Evangelical Lutheran Church in America.
Funded through sales revenue, Augsburg Fortress is called to provide
products and services that communicate the Gospel, enhance faith, and
enrich the life of the Christian community from a Lutheran perspective.
Part I
I had mad... 阅读全帖 |
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w********9
发帖数: 8613 | 33 FINA裁决的分析部分是很详细合理的
希望CAS也能公布它自己的分析
https://www.swimmingworldmagazine.com/news/sun-yang-verdict-the-fina-doping-
panel-ruling-that-triggered-wada-action/
6. ANALYSIS
6.1 A fundamental issue to evaluate is whether the Athlete was properly
notified by the IDTM testing team. This is mandated in ISTI Article 5.4.
Specifically, whether the DCO and the DCA and the BCA provided to the
Athlete, pursuant to the ISTI, proper official documentation from IDTM
evidencing their authority to collect a sample fr... 阅读全帖 |
|
g********d
发帖数: 19244 | 34 ☆─────────────────────────────────────☆
somesome (dingding) 于 (Sat May 18 20:18:22 2013, 美东) 提到:
这个尺寸的车试驾了一圈，还是发现这个综合最好。在Luxury里面性价比也应该是最高
的了。和附近3个州dealer周旋了很久，终于找到了一辆配置正和我意的，而且这辆恰
恰是刚刚新出的2013 mid year款，就是+了remote start功能（有效距离80米），LD最
喜欢这个功能，于是不再犹豫，出手了。
4WD, fully loaded, 白车+黑内饰（其实米色内饰更漂亮，但是由于以前试驾过2辆pre
-owned，尽管只有1-2年，但是米色的真皮已然惨不忍睹，想想家里面2个淘娃，只能走
黑色，不过也还说的过去）。79,835 MSRP，最后9k off+TTL成交。再等几个月肯定还
能便宜，不过懒的等了，先爽了再说。
比较突出的优点：马力十足，驾驶感在这个级别里面算是top了；360度环视摄像头超赞
，绝对是未来各车型必备；technology package几个功能超级实... 阅读全帖 |
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g****y
发帖数: 436 | 35 总结了上诉案例的一些判据
[rl]
It is important to note that none of the letters establishes how the author
relies on the petitioncr's
findings within their own work, nor do they explain how the petitioner's
work is being utilized and
applied in the field. Most identify how the petitioner's findings can or
will affect the field, but all
lack examples of how his findings have already had an effect on the field
[authorship,first,second author,secondary,second]
The petitioner provides 16 articles in which he is ... 阅读全帖 |
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h**********7
发帖数: 218 | 36 IO是NSC的0201， 看到版上之前也有一个人被他NOID了，回复内容类似，不知道这人算
不算杀手？有人在他手上approve过吗？
呼唤版上各位大神，求分析，求拍醒！
基本情况如下；电子方向博士，现在科技公司做研发，claim了authorship, reviewing
, contribution
文章13（IF 2-13）
Review： 26 （7 journals）没有太好的杂志 (IF 2-4)
引用：递交时240+
推荐信：6封，4 independent，一欧洲，一澳大利大，四美国
找了律师，先提交eb1a然后追加pp，一周后收到NOID。IO判断单项满足标准，但
totality不够，NOID notice很长，批判的点比较多，我看不出IO真正关注的是哪一点
或者是每条都不放过，我总结了要点如下，也把原文附在文后了。
Review：
1. 仅有审稿的客观证据不足以证明sustained national or international
acclaim
2. 审稿次数被律师搞错了！
3. 不能证明比其他领域中的researcher审稿多，尤其和ed... 阅读全帖 |
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h**********7
发帖数: 218 | 37 上来和大家通报一声，真心感谢大家的建议和帮助！（可惜包子之前发光了）
加了四封推荐信（都是引用过文章的人），要了几封editor的信证明是领域top的人才
能被邀请审稿，
最主要的还是要挖料挖料挖料（之前不上心 惨痛教训啊筒子们），然后要在推荐信中
体现， 另外最后决定的回信策略是相当于重写了一遍PL， 而没有针对io逐条反驳（因
为可能就是个模版io拿来贴一下吧）
感觉这个0201还算比较公正，也有可能holiday season了，心情比较好^_^
以上希望可以给大家一些回复noid的参考信息，由于一些原因，更详细内容就不方便写
了，有问题欢迎私信询问！
顺便求485的bless～～～～～
＝＝＝＝＝＝＝＝＝＝＝＝＝＝
IO是NSC的0201， 看到版上之前也有一个人被他NOID了，回复内容类似，不知道这人算
不算杀手？有人在他手上approve过吗？
呼唤版上各位大神，求分析，求拍醒！
基本情况如下；电子方向博士，现在科技公司做研发，claim了authorship, reviewing
, contribution
文章13（IF 2-13）
Review： 26 （7 jou... 阅读全帖 |
|
t*******d
发帖数: 44 | 38 【 以下文字转载自 I140 讨论区 】
发信人: nadar (咖啡不加糖), 信区: I140
标 题: 请教: NSC Eb1B, NOID 回复之后，denial
发信站: BBS 未名空间站 (Thu Aug 9 20:44:16 2018, 美东)
请教版上给我大牛，我下面这种情况应该appeal 还是二进宫？下面写的可能有点乱，
请多担待。
-----------
背景：
a. 数学专业， tenure track ap，
b. 9篇journal + 1 book chapter+ 3篇会议文章， 160 citations （google scholar）
c. 30 + reviews， 参加过一次nsf panel review
claim 老三样： authorship，judge，contribution
------------
timeline:
06/29/2018 initial petition received at NSC
07/06/2018 NOID issued
08/04/2018 NOID response received ... 阅读全帖 |
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b***i
发帖数: 10018 | 39 貌似这位美女也是有目的的...
http://www.vegsource.
com/news/2010/07/china-study-author-colin-campbell-slaps-down-critic-den
ise-minger.html
Reply to Denise Minger
by Dr. T. Colin Campbell, PhD, author The China Study
Ms. Denise Minger has published a critique of our book, The China Study,
as follows.
The China Study: Fact or Fallacy? by Denise Minger - article found at:
http://bit.ly/9s5pn8
It is both interesting and gratifying that there has been such a huge
response, both on her blog and on those of others... 阅读全帖 |
|
w******e
发帖数: 953 | 40 How safe does transgenic food need to be?
Laura DeFrancesco1
Journal name:
Nature Biotechnology
Volume:
31,
Pages:
794–802
Year published:
(2013)
DOI:
doi:10.1038/nbt.2686
Published online 10 September 2013 Corrected online 26 September 2013
Article tools
PDF
How safe does transgenic food need to be?
Download as PDF (812 KB) View interactive PDF in ReadCube
Citation
Reprints
Rights & permissions
Article metrics
Disputes over how to assess a foodstuff's safety continue to play into
public fears a... 阅读全帖 |
|
H******7
发帖数: 34403 | 41 【环球网综合报道】据台湾“中央社”3月9日报道，日本“311”强震与海啸至今已近3
年，仍有数千民众下落不明，57岁高松康雄的妻子便是其中之一，高松背着水肺潜水装
备，准备在饱受海啸侵袭的岸边，踏入冰冷的海水，寻回妻子的遗骸。
“311”震灾即将届满3周年之际，木船随着浪花起起伏伏，高松奋力穿上一件特大号的
橡皮干式潜水衣，保护他在潜入3月天灰暗的太平洋时，不受寒冷侵扰。
高松说：“她是个温和、善良的人，她永远在我身边，身心两方面都是。我很想她，想
念那个占据我心里大部分的她。”
高松是1名训练有素的公交车司机，却从不是个学习水肺潜水的天生好手，也曾担心自
己无法潜水。
但当他想起爱妻祐子在遭到近20米高的巨浪吞没前，最后传给他的简讯，就有一股力量
驱使他潜水。
日本2011年3月11日发生海底强震引发海啸，海啸以喷射机的速度直扑海岸，祐子在当
天下午3时21分传送的简讯中，仅仅表示“我想回家”。
高松说：“这是她传的最后一封简讯。”
他说：“只要想到她还在那里，我的感觉糟透了，我希望能尽快带她回家。”
------------------
cmfrmchn 发表评论于 2014-03... 阅读全帖 |
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O*****c
发帖数: 679 | 42 这个道理，凡是混商学院的都懂。这就叫 data sufficient。好比说，f(x)=x^2。
如果你是圈内人，你知道x=3，所以f(x)=x^2，必定是9.这是sufficient的。
我们这种草根，光看个报道，就好比人家告诉你，f(x)=x^2=9，问你x=3 (你认为的好
事)，还是=-3（倒霉了）.
99%倒霉就倒霉在，总是data in-sufficient。
所以做人，就是做99%的人，要有99%的腔调。就是那种上层的东西，好比谁谁是院士啊
，谁谁下一届校长啊，那种跟我们没关系。我们不是那个圈子。是那个圈子的，那是厉
害，是关系到自己的未来。
可惜我们不是。不但不是，还是整天data in-sufficient的。
我们要关心的是：工资多少，bonus有没有，怎么去肏好屄，怎么多上几个女生，怎么
团购汽车，怎么买个值钱的房子，怎么去找精算子做loan，下一步怎么混。。。
尤其注意的是：做99%的，就是要少输为嬴。要赶紧毕业，要能找到正式工作，要去好
公司，要肏好屄，就是家里有房子，父母还能赚钱，而且是独生女儿，要买个好学区的
房子，要找精算子做个搞来搞去很低利息的loan... 阅读全帖 |
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a****t
发帖数: 95 | 43 INTRODUCTION
Cancer Translational Medicine provides rapid and efficient peer-review
publications on innovative cancer investigation or translational work
related to oncology and precision medicine. Contributions focusing on
systemic anticancer therapy including gene-therapy, immuno-therapy, and some
new bio-therapies, randomized trials (including negatives ones), top-level
guidelines, molecular pathology, bioinformatics, modern statistics, and
biotechnologies. Radiotherapy, chemotherapy, surgery... 阅读全帖 |
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a****t
发帖数: 95 | 44 INTRODUCTION
Cancer Translational Medicine provides rapid and efficient peer-review
publications on innovative cancer investigation or translational work
related to oncology and precision medicine. Contributions focusing on
systemic anticancer therapy including gene-therapy, immuno-therapy, and some
new bio-therapies, randomized trials (including negatives ones), top-level
guidelines, molecular pathology, bioinformatics, modern statistics, and
biotechnologies. Radiotherapy, chemotherapy, surgery... 阅读全帖 |
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x***r
发帖数: 60 | 45 申请要求
Requirements
就是一般要求， 外加 200小时PATIENT care experience
我没有， 不知道how and where to find volunteer opportunity. Any suggestions?
因为在德州， 还prefer spainish class
PA Tina Kaufman (right) enjoys the teamwork involved doing indigent care at
Parkland Memorial Hospital.professional or volunteer
We know you’re looking for an educational experience of the highest quality
. To meet your expectations and satisfy accreditation requirements, we set
the bar high for our applicants. Here are the steps you’ll ne... 阅读全帖 |
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k*******a
发帖数: 772 | 46 sufficient本来就不是唯一的，有很多，本身(x1,..xn)就是一个sufficient
statistic, 如果要找好的sufficient statistics那就找minimum sufficient
complete statistic |
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I*****a
发帖数: 5425 | 47 Come on. Don't get mad. We were just discussing a concept.
No offense here as before.
I think your claim some other people and I don't agree w/ is in the 2nd post
of
this thread, that is "likelihood is sufficient". That's all. And I said I
never saw this term, or alternatively the claim like "some likelihood is
suff
icient". People usually talk about "** statistics are sufficient" instead.
As I replied in the 2nd or 3rd post before this, I tried to search for this
term and failed.
I did ask two ... 阅读全帖 |
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p********a
发帖数: 5352 | 48 ☆─────────────────────────────────────☆
tamuer (hoho) 于 (Fri Oct 21 20:41:07 2011, 美东) 提到:
前面有人问bootstrap能不能更逼近真理。我不是这方面的专家，但是发表一点自己的简
介，希望和大家交流一下吧。
总体而言， 我觉得使用bootstrap不能说是逼近真理。但是有的时候，确实比不做boot
strap比更好，或者比使用单一样本更接近真理。大家都觉得bootstrap没有真正用处的
原因是觉得所有bootstrap重复抽样的样本都是从一个样本里出来的，所以用bootstrap
的效果不会比使用原来的样本好多少。这一点我也同意。
但是从另外一个角度来说，一个样本里面包含的信息是很丰富的，我们是否已经完全利
用了现有样本里面的信息呢？最简单的例子来说，一个样本，很多时候我们用就用samp
le mean来summarize样本信息，但是使用sample mean的时候又忽视了多少样本中原来的
信息呢? 比如各种quantile的信息之类。 类似的，换一个角度来说，bootstrap是在... 阅读全帖 |
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a***r
发帖数: 420 | 49 正在复习Casella那本书上的data reduction和point estimation，相当的有点纠结啊
尤其关于Lehmann-Scheffe Theorem:
Unbiased estimators based on complete sufficient statistics are unique.
书上主要做了如下讨论：
Theorem 7.3.23: Let T be a complete sufficient statistic for a parameter
theta, and phi(T)be any estimator based only on T. Then phi(T) is the unique
best unbiased estimator of its expected value q(theta).
这个phi(T)，我的理解是, Rao-Blackwell里的,比如W(X) unbiased for q(theta), 那么
phi(T)=E(W(X)|T(X))就是一个UMVUE.
那么这个是不是可以理解为，对于一个分布p(x;theta)... 阅读全帖 |
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