P****D
发帖数: 11146 | 1 1. 好人哪！妾刚开始这样自称的时候，他们一个两个都喊雷。
2. 妾平时看到的effect size一般都是用Cohen's d或者Cohen's f^2来量度的，还真是
很少见直接上difference of the means的，主要问题是你不标准化就很难判断一个
effect是强还是弱。大概这是因为妾平时比较means远远比比较proportions的时候多吧。
3. to 楼主——PASS 11 -> Proportions -> Two independent proportions ->
equivalence test for two proportions (differences) 可以算这个。
or
standard
with
to |
|
v****i
发帖数: 479 | 2 Scenario A: A Monte Carlo experiment was conducted to compare the widths of
confidence intervals (CIs) produced from two different methods. Briefly,
1000 data sets were randomly generated. To each of the data sets, the two
methods were applied to obtain CIs for the parameter of interest. The widths
below are from 10 of the 1000 data sets. Relevant summary statistics for
all 1000 are provided.
Data Set 1 2 3 4 5 6 7 8 9 … 1000 Mean
SD
B method 1.05 0... 阅读全帖 |
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w*********s
发帖数: 2136 | 3 Jeffry John Aufderheide
vactruth.com
05/25/2010
http://vactruth.com/2010/05/25/vaccines-rockefeller-social-control/
PART I.
History books proclaim with absolute certainty that the pinnacle of public
health is defined by the polio vaccine program. Disease finally conquered by
science. The polio effort was a benchmark for the public to mentally accept
the concept “shots prevent disease.” However, hidden to most Americans
was an elaborate Public Relations scheme being carefully applied by
Rockefell... 阅读全帖 |
|
c*******2
发帖数: 617 | 4 好文欣赏
关键点： 为了避免民主轮胡搅蛮缠， 作者迅速从中印对比转向印孟对比。
从印度能否追上中国的伪问题， 反问“印度能追上孟加拉国吗”
I was awakened early one morning recently by someone who said he was
enormously enjoying my on-going debate on economic growth in India. I was
very pleased that I had given someone some joy, but I also wondered what on
earth he could be talking about, since I have not been involved in any such
debate. As it happens, I am getting a steady stream of telephone calls and
electronic communication about this alleged debate. Since I ... 阅读全帖 |
|
H****g
发帖数: 14447 | 5 这是你引用那段话的全文。请你具体指出，你主贴里说的马克思”赞美“鸦片战争等谬
论是根据那段话”归纳“出来的？
Revolution in China and In Europe
June 14, 1853
A most profound yet fantastic speculator on the principles which govern the
movements of Humanity was wont to extol as one of the ruling secrets of
nature what he called the law of the contact of extremes. The homely proverb
that “extremes meet” was, in his view, a grand and potent truth in every
sphere of life; an axiom with which the philosopher could as little dispense
as the astronomer with... 阅读全帖 |
|
x******g
发帖数: 33885 | 6 3. "The emancipation of labor demands the promotion of the instruments of
labor to the common property of society and the co-operative regulation of
the total labor, with a fair distribution of the proceeds of labor.
对于上面这段话，马克思作了如下的评点：
"Promotion of the instruments of labor to the common property" ought
obviously to read their "conversion into the common property"; but this is
only passing.
What are the "proceeds of labor"? The product of labor, or its value? And in
the latter case, is it the t... 阅读全帖 |
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p****s
发帖数: 3184 | 7 摘要：
In market economies, per capita GDP is directly proportional to the
population fraction with verbal IQ equal to or greater than 106.
We can make a pretty good guess. In all his versions, Man is the product of
adaptation to environments that existed more than 50,000 years ago. Africa,
Europe and Asia presented three distinct adaptational challenges resulting
in three major races: Negroid, Caucasoid and Mongoloid, each differing from
the other in certain physical, mental and psychological aspe... 阅读全帖 |
|
g********d
发帖数: 4174 | 8 Posted on Advocate.com August 25, 2011 09:50:00 PM ET
Census: New Mexico, Rhode Island Heavily Gay
By Trudy Ring
Census Bureau director Robert Groves The Census Snapshot of same-sex couples
across the U.S. is now complete, with the Census Bureau’s release and the
Williams Institute’s analysis of the data on five final states.
The states for which information was released today include two with
significant proportions of gay couples — New Mexico and Rhode Island — and
three with smaller numbers —... 阅读全帖 |
|
l****z
发帖数: 29846 | 9 Romney Edges Out Santorum in Ohio, Takes Six States to Santorum's Three
CNSNews.com) – Mitt Romney squeezed a narrow victory in Ohio’s Republican
presidential primary overnight and won five other Super Tuesday states, but
Rick Santorum’s strong showing in the Buckeye state and three victories
elsewhere deprived the former Massachusetts governor of the type of decisive
sweep his campaign may have been hoping for.
A nail-biting count in the important battleground state ended with Romney
edging out... 阅读全帖 |
|
l****z
发帖数: 29846 | 10 Power costs shrink as share of Europe's rising energy bills
* In EU15 about half the household bill is charges, tax and subsidies
By Karolin Schaps and Barbara Lewis
LONDON/BRUSSELS, Nov 5 (Reuters) - Europeans are paying the steepest energy
bills in four years and face ever higher payments as governments pile on
extra charges to help finance a 1 trillion euro ($1.4 trillion)
modernisation of Europe's energy infrastructure.
Politicians from Britain to Germany, Italy to Romania, under pressure fr... 阅读全帖 |
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l****z
发帖数: 29846 | 11 http://www.forbes.com/sites/theapothecary/2014/05/10/new-mckins
Avik Roy , Forbes Staff
One of the principal flaws in the coverage of Obamacare’s exchange
enrollment numbers to date has been that the press has not made distinctions
between those who have “signed up” for Obamacare-based plans, and those
who have actually paid for those plans and thereby achieved enrollment in
health insurance. A new survey from McKinsey indicates that a large majority
of people signing up are now paying for their... 阅读全帖 |
|
L******d
发帖数: 2461 | 12 左边数轴的percentage是入学人数里面的Asian占的proportion吗？
右边的数轴的单位是什么，是Asian绝对人口数，还是Asian在总人口中所占的
proportion?
看起来像是绝对数，这样是不能说明问题的。因为其他族裔的人口绝对数可能也同时在
增长，导致相对的proportion保持不变，所以入学的proportino也没有改变。 |
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x***2
发帖数: 946 | 13 谁分析一下后面的州
Apr 26 Connecticut 28 Primary (closed) Winner-take-most
Delaware 16 Primary (closed) Winner-take-all
Maryland 8 Primary (closed) Winner-take-all
Pennsylvania 17 Primary (closed) Winner-take-all
Rhode Island 19 Primary (semi-closed) Proportional
May 3 Indiana 57 Primary (open) Winner-take-all
May 10 Nebraska36 Primary (closed) Winner-take-all
West Virginia 34 Primary (semi-closed)
May 17 ... 阅读全帖 |
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a***s
发帖数: 616 | 14 教的是统计/数学课程。
博士期间在一所公立大学teaching，通常情况是上到1/3学期就只剩一半左右学生来上
课，不过最后evaluation都在平均分上下。如果教的课程比较advance，来的学生会多
些。因为那时我也没花太多时间在teaching上，所以对此也不是太在意。另外我从不
take attendance，因为我觉得大家都是成年人。
现在在另一所公立大学做postdoc。这学期教两门课，一门初级统计（non-calculus
based），另一门是比较难的本科概率。统计课是120人左右，概率课是35人左右。
现在学期过半，来上课的人也稳定下来，概率课有一半左右，而统计课却是不到一半。
让我尤其伤心的是统计课。我知道学生数学基础非常弱，所以花很多时间做课堂讲义（
ppt），加入非常多的图来帮助理解。我在课堂上也问很多问题，但是学生们却不太参
与，也就那么几个常回答问题的人会回应，其他人要么表情木讷，不知道是在听还是没
听，要么就在干自己的事，看电脑或者看手机。还有的学生会在课堂上离开，每次都让
我觉得很难受。
我自己留心了下学生离开课堂的时间。有的时候是有学生问问题，我就对... 阅读全帖 |
|
a***s
发帖数: 616 | 15 教的是统计/数学课程。
博士期间在一所公立大学teaching，通常情况是上到1/3学期就只剩一半左右学生来上
课，不过最后evaluation都在平均分上下。如果教的课程比较advance，来的学生会多
些。因为那时我也没花太多时间在teaching上，所以对此也不是太在意。另外我从不
take attendance，因为我觉得大家都是成年人。
现在在另一所公立大学做postdoc。这学期教两门课，一门初级统计（non-calculus
based），另一门是比较难的本科概率。统计课是120人左右，概率课是35人左右。
现在学期过半，来上课的人也稳定下来，概率课有一半左右，而统计课却是不到一半。
让我尤其伤心的是统计课。我知道学生数学基础非常弱，所以花很多时间做课堂讲义（
ppt），加入非常多的图来帮助理解。我在课堂上也问很多问题，但是学生们却不太参
与，也就那么几个常回答问题的人会回应，其他人要么表情木讷，不知道是在听还是没
听，要么就在干自己的事，看电脑或者看手机。还有的学生会在课堂上离开，每次都让
我觉得很难受。
我自己留心了下学生离开课堂的时间。有的时候是有学生问问题，我就对... 阅读全帖 |
|
d****y
发帖数: 58 | 16 刚面完。答的不咋样。
1. suppose four colors are there, we did a survey. People (n) choose
different colors (red, green, yellow, blue).
we get the proportion of people who use red as x1/n.
What is the accuracy for this?
2. Imaging now that we know from prior studies that a certain proportion of
users responds to questions randomly. How can we assess this proportion of "
random clickers"? |
|
w*********s
发帖数: 2136 | 17 Jeffry John Aufderheide
vactruth.com
05/25/2010
http://vactruth.com/2010/05/25/vaccines-rockefeller-social-control/
PART I.
History books proclaim with absolute certainty that the pinnacle of public
health is defined by the polio vaccine program. Disease finally conquered by
science. The polio effort was a benchmark for the public to mentally accept
the concept “shots prevent disease.” However, hidden to most Americans
was an elaborate Public Relations scheme being carefully applied by
Rockefell... 阅读全帖 |
|
j*****1
发帖数: 1107 | 18 我google了near and far field, 还有magnet, here is the excerpt
The near-field is remarkable for reproducing classical electromagnetic
induction and electric charge effects on the EM field, which effects "die-
out" with increasing distance from the antenna (with magnetic field strength
proportional to the inverse-cube of the distance and electric field
strength proportional to inverse-square of distance), far more rapidly than
do the classical radiated EM far-field (E and B fields proportional simply
... 阅读全帖 |
|
w*********s
发帖数: 2136 | 19 【 以下文字转载自 Military 讨论区 】
发信人: whiteclouds (/ 参考消息 /), 信区: Military
标 题: ------ 疫苗产业与洛克菲乐集团 -------
发信站: BBS 未名空间站 (Sat Nov 27 20:31:19 2010, 美东)
Jeffry John Aufderheide
vactruth.com
05/25/2010
http://vactruth.com/2010/05/25/vaccines-rockefeller-social-control/
PART I.
History books proclaim with absolute certainty that the pinnacle of public
health is defined by the polio vaccine program. Disease finally conquered by
science. The polio effort was a benchmark for the public to mentally accept... 阅读全帖 |
|
f******g
发帖数: 1697 | 20 ☆─────────────────────────────────────☆
sarahj (sarah) 于 (Tue Aug 10 17:06:02 2010, 美东) 提到:
发信人: sarahj (sarah), 信区: Fashion
标 题: 大胆奔。。。。俺给女朋友们拍的艺术照！。。。。
发信站: BBS 未名空间站 (Tue Aug 10 17:03:01 2010, 美东)
周末起了一大早出门给女朋友拍照，大家自编自导折腾了一个上午。被拍的mm自己化妆
，自己带的衣
服。打光的是苹果脸姐姐，贴照片前先借用她的话：
俺们没有在炫耀美貌啊身材啊衣服的(所以大家请请拍哈~），拍摄是俺们的兴趣！被拍
的mm非专业
MODEL（其实连业余的都不是）当然不如明星模特那样完美。 就是想趁大家年轻的时候
留下美好的记
忆。。。 俺们的口号是:任何平凡的女生都能有美丽的照片。
☆─────────────────────────────────────☆
YaTou22 (公主的心，丫头的命~) 于 (Tue Aug 10 17:15:22 2010, 美东) ... 阅读全帖 |
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i*********5
发帖数: 19210 | 21 I was at Interbike for the first time this year, and a big trend was crank
arm-based power meters. There were at least three there:
Rotor Power,
Pioneer, and
StagesOne.
The fundamental physics behind each of these three units is the same: to
propel the bike force is transmitted via a mechanical path: pedal body to
pedal spindle to crank arm to (left side only) bottom bracket spindle to
spider to chainring to chain to cassette to free hub body to spokes to rim
to tires to road.
You can in theory ... 阅读全帖 |
|
|
w*********s
发帖数: 2136 | 23 Jeffry John Aufderheide
vactruth.com
05/25/2010
http://vactruth.com/2010/05/25/vaccines-rockefeller-social-control/
PART I.
History books proclaim with absolute certainty that the pinnacle of public
health is defined by the polio vaccine program. Disease finally conquered by
science. The polio effort was a benchmark for the public to mentally accept
the concept “shots prevent disease.” However, hidden to most Americans
was an elaborate Public Relations scheme being carefully applied by
Rockefell... 阅读全帖 |
|
l**********1
发帖数: 5204 | 24 Iceberg Alert for NIH
>On 2 January 2013, budget sequestration
mandated by the Budget Control Act of 2011 could reduce NIH extramural
funds still further, producing a staggering cumulative 41% decline in a
single decade (in constant dollars, from 2004 to 2014
and
>In contrast, China’s governmental support for
biomedical research may double that of the United States, or even, in
proportion
to gross domestic product (GDP), quadruple it by 2017.*
In dollars.
Henry R. Bourne and Mark O. Lively
Henry... 阅读全帖 |
|
k*****1
发帖数: 454 | 25 我几乎可以肯定你没有看过，或者没有仔细看过HH 1952年那篇经典的文章。而且很不
幸的是，你也根本没有仔细阅读我的原文就急不可耐的跳出来。我自己本人就是专门做
离子通道数学模型的，H-H 那篇1952年的文章是需要经常阅读的，尽管如此，在写前文
之前，为了避免错误，我还特意重新看了一遍。因为你没有仔细看过，所以你的叙述当
中错误太多。我指出其中一点，剩下的等你看完了之后我们再讨论：
(1)
“电导和跨膜离子浓度差的关系不是假设，是根据扩散定律推倒的。”
1952年的原文当中推导的原句是: "...we shall suppose that the sodium
conductance is proportional to the such molecules inside the membrane but
independent of the number on the outside. From Boltzmann's principle, the
proportion "Pi" of molecules on the inside of the membrane is relat... 阅读全帖 |
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k*****1
发帖数: 454 | 26 你对Boltzman's principle的理解完全错误的。Boltzman's principle 只能用来描述
类似于 气体分子/离子 这样的微观分子，而voltage sensor简直是不知所云。
（1）在原文当中，已经很明确的写了，“From Boltzmann's principle the
proportion Pi of the molecules on the inside of the membrane is related to
the proportion on the outside, PO, by Pi/PO==exp[(w + zeE)/kT]," 这是非常经
典的热力学上描述分子在某个能量状态下的概率。比如说 “Pi” 就是 某（带电）分
子位于细胞膜内部的概率（看原文！！） 对了，很好奇的问一下你的本科背景是什么
？你学过统计物理或是热力学吗？
(2)你一直强调的那个voltage sensor 和 6个电荷是怎么来的呢？ 原文当中也解释的
很清楚：
由上面的方程组可以得出： Pi =constant x exp[zeE/kT]. 记住，在这里 Pi是... 阅读全帖 |
|
w***x
发帖数: 265 | 27 “所以从统计物理的角度上，同时又最贴近实际情况来理解 H-H 模型，就是 首先确定了
钠离子在细胞内部的概率为P1，细胞外的概率为P0，其中P1+P0=1 并且 P1/P0=exp（函
数）”
真心不是Na离子，我粘贴原文：
In order to illustrate the possible meaning of this result we shall suppose
that a charged molecule which has some special affinity for sodium may rest
either on the inside or the outside of the membrane but is present in
negligible concentrations elsewhere. We shall also suppose that the sodium
conductance is proportional to the number of such molecules on the inside of
the membrane ... 阅读全帖 |
|
D*a
发帖数: 6830 | 28 你自己看吧
1
00:00:01,200 --> 00:00:03,130
Hello, and welcome back to Animal
Behavior.
2
00:00:04,590 --> 00:00:06,189
When sexually reproducing animals
produce
3
00:00:06,189 --> 00:00:08,330
their offspring, they have a choice.
4
00:00:08,330 --> 00:00:13,030
They can produce either a son or a
daughter in any given reproductive event.
5
00:00:13,030 --> 00:00:15,730
In this lecture, we'll look at the
question of whether in certain
6
00:00:15,730 --> 00:00:17,330
circumstances it might pay parents t... 阅读全帖 |
|
|
y********g
发帖数: 81 | 30 1.Current and load cap. Its current is a
function of length, width, bias, etc.
2. 45nm, 32nm is half pitch dimension. This
is not transistor physical gate length nor
effect channel length. Refer to device
physics for detail.
3. 1/rate? how do you define resolution?
4. NMOS is stronger than PMOS in term of
larger current under the same condition.
NMOS conducts electron current whereas PMOS
conducts hole current. Whichever carrier it
is, current is proportional to mobility.
mobility is inverse pro... 阅读全帖 |
|
w*********s
发帖数: 2136 | 31 Jeffry John Aufderheide
vactruth.com
05/25/2010
http://vactruth.com/2010/05/25/vaccines-rockefeller-social-control/
PART I.
History books proclaim with absolute certainty that the pinnacle of public
health is defined by the polio vaccine program. Disease finally conquered by
science. The polio effort was a benchmark for the public to mentally accept
the concept “shots prevent disease.” However, hidden to most Americans
was an elaborate Public Relations scheme being carefully applied by
Rockefell... 阅读全帖 |
|
m*****8
发帖数: 27 | 32 in a survey, 344 of 1170 subjects said "yes".
a. Estimate the population proportion who would say "yes".
b. Conduct a significance test to determine whether a majority or minority
of the population would say "yes". Report and interpret the P-value.
我这样做对么？
a. 344/1170? If this is true,just use sample proportion to estimate
population proportion？That's it?
b. Ho:p>=50%, H1:p<50%,
z=(344/1170-50%)/【(1-50%)*50%/1170】^-0.5 = -14< -1.96,
so reject Ho,so minority of population would say yes,is that co |
|
l****a
发帖数: 352 | 33 那我这么说吧，取sample是为了exame or approximate a proportion of favor A for
the whole population. 上面那些公式都是based on sampling distribution of
proportion p(A) derived from central limit theory.太理论了？
这么想，如果favor A的sample proportion估计是20%，那么需要更多的sample来估计
整个sampling distribution 你若是只sample了10个，保不定都是favor A的了，还需
要不favor A 来估计整个sampling distribution啊
这么想清楚了些吗？ |
|
g******n
发帖数: 339 | 34 你这个自我称呼让我回到了遥远而性感的古代。“垆边人似月，皓腕凝霜雪”，哈哈，
想得太多了。
回到这个讨论的问题吧， 一般来说，effect size 指的是diffrence of the means or
proportions。不过在medical jurnal上好像也有人把这个均值的差除以一个standard
deviation,算是一个standardized effect size. If the end point is a
continuous variable, and the comparison is between 2 groups with common
standard deviation assumption, then the standardized effect size, along with
alpha and beta, would be sufficient for a sample size calcultion based on
normal approximation. However, this is not the case for ... 阅读全帖 |
|
p********a
发帖数: 5352 | 35 ☆─────────────────────────────────────☆
cici (full house) 于 (Mon Nov 7 08:33:47 2011, 美东) 提到:
对于logistic regression
log（pi/1-pi）=b0+b1x1+b2x2
我现在已知independent variables和response variable{log(pi/1-pi)}
我要怎么做才能把参数b0,b1,b2 fit出来？非常感谢
☆─────────────────────────────────────☆
sleephare (I+don't+know.) 于 (Mon Nov 7 14:16:38 2011, 美东) 提到:
SAS, R?
☆─────────────────────────────────────☆
cici (full house) 于 (Mon Nov 7 16:19:05 2011, 美东) 提到:
R,thanks
☆────────────────────────────────────... 阅读全帖 |
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c*********9
发帖数: 46 | 36 我想做以下这个事情
DATA A里存着不同combinations对应的proportion。
Obs VA VB VC prop
1 1 1 1 0.84963
2 1 1 2 0.70089
3 1 1 3 0.99824
4 1 2 1 0.59399
5 1 2 2 0.21603
6 1 2 3 ... 阅读全帖 |
|
g******7
发帖数: 1433 | 37 假设我有500个row，有的variable是categorical的（male，female），想在其中做一
个proportion test，看看他们的proportion是不是significant different，我的sas
code该怎么写，是先把proportion算出来在run test吗，有没有比较简洁的code？
谢谢大家！ |
|
D**u
发帖数: 288 | 38 Good question, and I happen to know the answer.
It is a good call by you, you are absolutely right that we can test two
proportions using chi-square test. But the underlying truth is that: When
comparing two large sample proportions the Chi-square test is EQUIVALENT to
t test(z test), the Chi-square is simply Z-square in this case.
And the advantage of Chi-square test is that it allows us to compare 3, 4 or
more sample proportions at the same time which t-test can't do.
But if just 2 sample why ... 阅读全帖 |
|
D**u
发帖数: 288 | 39 You can build contingency table on proportions, proportions are basically
counts. Sample proportions are same 可以理解为 variable is independent from
sample choices. 两种理解问题的方法。所以可以用chi-square test |
|
D**u
发帖数: 288 | 40 Good question, and I happen to know the answer.
It is a good call by you, you are absolutely right that we can test two
proportions using chi-square test. But the underlying truth is that: When
comparing two large sample proportions the Chi-square test is EQUIVALENT to
t test(z test), the Chi-square is simply Z-square in this case.
And the advantage of Chi-square test is that it allows us to compare 3, 4 or
more sample proportions at the same time which t-test can't do.
But if just 2 sample why ... 阅读全帖 |
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D**u
发帖数: 288 | 41 You can build contingency table on proportions, proportions are basically
counts. Sample proportions are same 可以理解为 variable is independent from
sample choices. 两种理解问题的方法。所以可以用chi-square test |
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m****s
发帖数: 18160 | 42 ☆─────────────────────────────────────☆
whiteclouds (/ 参考消息 /) 于 (Tue Mar 22 18:47:29 2011, 美东) 提到:
投诉人： Whiteclouds
投诉对象：我爱宝宝版主mitbbx及版副catdoudou
投诉标题：投诉我爱宝宝版主mitbbx及版副catdoudou大搞新闻网禁误导广大家长
投诉目标：罢免
投诉理由：
1. 事关每个人身心健康。你们凭什么封禁医药界的负面消息和非主流消息？
2. 关于疫苗利弊的讨论早已进入主流媒体了。你凭什么不让大家看到？
3. 药品（包括疫苗）近年屡有recall. 你凭什么禁止有关信息来误导家里有小宝宝的父母去盲目迷信药品质量？
4. 美加庸医遍地都是，医疗事故屡见不鲜。你凭什么制造版面气氛让家长对处方和诊断不过脑子的去盲信？
5. 凡事要听多方面意见，有点科学精神，你们动辄删贴封人缺乏领导版面的基本素质
6. 为人父母要首先自己要学会尊重不同意见，不然以后怎么教育好孩子？
7. 综上所述，建议罢免！
发信人: whiteclouds (/ 参考消息... 阅读全帖 |
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S******9
发帖数: 2837 | 43 40. A study is conducted to investigate the prevalence of past infection
with genital herpes among students attending a large coeducational
Midwestern university. After obtaining informed consent, the study
participants undergo antibody testing for herpes simplex virus 2 (HSV).
Which of the following is the most important factor in determining the
validity of a positive test?
A) The number of sexual partners of the student
B) The proportion of students infected with HSV
C) The proportion of stud... 阅读全帖 |
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i*********5
发帖数: 19210 | 44 【 以下文字转载自 Cycling 讨论区 】
发信人: ironman2015 (1/2 ironman x3), 信区: Cycling
标 题: Interbike 2012: Crankarm-based power meters
发信站: BBS 未名空间站 (Tue Sep 25 15:46:01 2012, 美东)
I was at Interbike for the first time this year, and a big trend was crank
arm-based power meters. There were at least three there:
Rotor Power,
Pioneer, and
StagesOne.
The fundamental physics behind each of these three units is the same: to
propel the bike force is transmitted via a mechanical path: pedal body to
pedal spindle to ... 阅读全帖 |
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r******n
发帖数: 351 | 45 非常感谢你的提醒。这是从wiki里摘的一段话：
http://en.wikipedia.org/wiki/Binomial_proportion_confidence_int
The central limit theorem applies poorly to this distribution with a sample
size less than 30 or where the proportion is close to 0 or 1. The normal
approximation fails totally when the sample proportion is exactly zero or
exactly one.
这里就是 sample proportion is exactly zero 的情况。 可以用exact或着wilson,
但是不能直接用Asymptotic normal。 我猜这是面试官想考察的内容。不知道如果用
normal近似的话怎么计算。
性。 |
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f**********g
发帖数: 2252 | 46 Avalon Reports Increase in Indicated Resources in the Nechalacho Rare Earth
Elements Deposit, NWT
Share
retweet
EmailPrint..Companies:Avalon Rare Metals, Inc. OrdinaAvalon Rare Metals Inc.
Related Quotes
Symbol Price Change
AVL 5.79 0.00
Press Release Source: Avalon Rare Metals Inc. On Thursday January 27, 2011,
4:37 pm EST
TORONTO, ONTARIO--(Marketwire - 01/27/11) - Avalon Rare Metals Inc. (TSX:AVL
- News)(AMEX:AVL - News) ("Avalon" or the "Company") is pleased to provide
an update on developme... 阅读全帖 |
|
f**********g
发帖数: 2252 | 47 Avalon Reports Increase in Indicated Resources in the Nechalacho Rare Earth
Elements Deposit, NWT
Share
retweet
EmailPrint..Companies:Avalon Rare Metals, Inc. OrdinaAvalon Rare Metals Inc.
Related Quotes
Symbol Price Change
AVL 5.79 0.00
Press Release Source: Avalon Rare Metals Inc. On Thursday January 27, 2011,
4:37 pm EST
TORONTO, ONTARIO--(Marketwire - 01/27/11) - Avalon Rare Metals Inc. (TSX:AVL
- News)(AMEX:AVL - News) ("Avalon" or the "Company") is pleased to provide
an update on developme... 阅读全帖 |
|
m**c
发帖数: 7299 | 48 【 以下文字转载自 WaterWorld 讨论区 】
发信人: msgc (为了下一代免遭变态残害), 信区: WaterWorld
标 题: Re: 相信吗? 43%的连环杀手是GAY!
发信站: BBS 未名空间站 (Fri Sep 14 15:15:11 2012, 美东)
Homosexual Serial Killers
Statistical analysis of the proportion of homosexuality among serial killers
,with a listing of prominent GLBT/homosexual serial killers
Although the proportion of serial killers who are known to have had
homosexual experience is high (over 43%), the total number of serial killers
is too small to make statistically relevant statem... 阅读全帖 |
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z****0
发帖数: 3942 | 49 感谢网友sgsgsgsg 提供了这个最新亚裔美国人在今年大选中立场的调查。
http://advancingjustice-aajc.org/sites/aajc/files/Inclusion-AAVS-2016.pdf
这个调查从2016年4月11日至5月17日，通过电话调查了1,212名亚裔选民。
调查抽样误差+/- 3%。 调查数据显示了以下趋势：
1. Asian Americans are shifting in party identification towards the
Democratic Party, and exclusionary rhetoric is a likely cause.
o There has been a 12-point increase in the proportion of Asian
Americans who identify as Democrats from 2012 to 2016 (pp.27-28)
o Bolstering evidence from 2014, our survey indicat... 阅读全帖 |
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c******i
发帖数: 4091 | 50 http://phys.org/news/2013-01-ancient-dna-reveals-humans-years.h
Ancient DNA reveals humans living 40,000 years ago in Beijing area related
to present-day Asians, Native Americans
January 21, 2013
Ancient DNA reveals humans living 40,000 years ago in Beijing area related
to present-day Asians, Native Americans Enlarge The leg of the early modern
human from Tianyuan Cave was used for the genetic analysis as well as for
carbon dating. Credit: MPI for Evolutionary Anthropology An international
team ... 阅读全帖 |
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