由买买提看人间百态

topics

全部话题 - 话题: priori
首页 上页 1 2 3 4 5 6 7 下页 末页 (共7页)
D*****r
发帖数: 6791
1
来自主题: TrustInJesus版 - [转载] The Improbability of God
Much of what people do is done in the name of God. Irishmen blow each other
up in his name. Arabs blow themselves up in his name. Imams and ayatollahs
oppress women in his name. Celibate popes and priests mess up people's sex
lives in his name. Jewish shohets cut live animals' throats in his name. The
achievements of religion in past history -- bloody crusades, torturing
inquisitions, mass-murdering conquistadors, culture-destroying missionaries,
legally enforced resistance to each new piece of ... 阅读全帖
R*o
发帖数: 3781
2
来自主题: TrustInJesus版 - Study and Exposition of Romans 1:18-32
G. Contribution of the Passage to Systematic Theology
This passage contributes in numerous ways to systematic theology. First, our
understanding of bibliology or more specifically, revelation (i.e., the stu
dy of how God makes himself known) is greatly enhanced by this passage. Here
in Romans 1:18-20 Paul does not appeal to inscripturated truth per se (i.e.
, truth revealed in the pages of the OT), but rather to the continual revela
tion of God in and through creation and in his wrath against si... 阅读全帖
R*o
发帖数: 3781
3
来自主题: TrustInJesus版 - Study and Exposition of Romans 1:18-32
G. Contribution of the Passage to Systematic Theology
This passage contributes in numerous ways to systematic theology. First, our
understanding of bibliology or more specifically, revelation (i.e., the stu
dy of how God makes himself known) is greatly enhanced by this passage. Here
in Romans 1:18-20 Paul does not appeal to inscripturated truth per se (i.e.
, truth revealed in the pages of the OT), but rather to the continual revela
tion of God in and through creation and in his wrath against si... 阅读全帖
D*****r
发帖数: 6791
4
来自主题: TrustInJesus版 - 神存在的证明
这个混淆概念和现实的证明几乎每一句都不成立,连在一起只是看起来成立罢了。这种
形式证明的问题休谟早就指出来过:
In his Dialogues Concerning Natural Religion, the character Cleanthes
proposes this criticism:
...there is an evident absurdity in pretending to demonstrate a matter
of fact, or to prove it by any arguments a priori. Nothing is demonstrable,
unless the contrary implies a contradiction. Nothing, that is distinctly
conceivable, implies a contradiction. Whatever we conceive as existent, we
can also conceive as non-existent. There is no bei... 阅读全帖
T*****n
发帖数: 2456
5
来自主题: TrustInJesus版 - 解经的法宝:Ad Hoc,附带一个范例
Ad hoc是拉丁文常用短语中的一个短语。这个短语的意思是“特设的、特定目的的(地
)、即席的、临时的、将就的、专案的”。这个短语通常用来形容一些特殊的、不能用
于其它方面的的,为一个特定的问题、任务而专门设定的解决方案。这个词汇须与a
priori区分。
http://en.wikipedia.org/wiki/Ad_hoc
Ad hoc 假设(又作“特例假设”或者“特设性假设”)
在科学和哲学领域,ad hoc 的意思是通过对一个理论提出外围假设以防止这个理论变
成一个错误的理论。
ad hoc hypothesis
Definition:
An ad hoc hypothesis, common in pseudoscience, the paranormal and religion,
is some idea which is created in order to explain away evidence which
contradicts some favorite idea. Sometimes an ad hoc hypothesis is very vague
,... 阅读全帖
T*****n
发帖数: 2456
6
来自主题: TrustInJesus版 - 解经的法宝:Ad Hoc,附带一个范例
Ad hoc是拉丁文常用短语中的一个短语。这个短语的意思是“特设的、特定目的的(地
)、即席的、临时的、将就的、专案的”。这个短语通常用来形容一些特殊的、不能用
于其它方面的的,为一个特定的问题、任务而专门设定的解决方案。这个词汇须与a
priori区分。
http://en.wikipedia.org/wiki/Ad_hoc
Ad hoc 假设(又作“特例假设”或者“特设性假设”)
在科学和哲学领域,ad hoc 的意思是通过对一个理论提出外围假设以防止这个理论变
成一个错误的理论。
ad hoc hypothesis
Definition:
An ad hoc hypothesis, common in pseudoscience, the paranormal and religion,
is some idea which is created in order to explain away evidence which
contradicts some favorite idea. Sometimes an ad hoc hypothesis is very vague
,... 阅读全帖
j*******7
发帖数: 6300
7
来自主题: TrustInJesus版 - Proof of God: Argument from beauty
http://en.wikipedia.org/wiki/Argument_from_beauty
Argument from beauty
The argument from beauty (also the aesthetic argument) is an argument for
the existence of a realm of immaterial Ideas or, most commonly, for the
existence of God.
History of the Argument[edit]
The argument from beauty has two aspects. The first is connected with the
independent existence of what philosophers term a 'universal', see Universal
(metaphysics) and also Problem of universals. Plato argued that particular
examples ... 阅读全帖
n********n
发帖数: 8336
8
信与行,乃信仰与善行的简称。宗教以信仰为基础,所以,不能不重信;宗教的目的(
至少是目的之一)乃指导行为,教人行善事、成义人、得救赎,所以,不能不重行。然
而,这并不意味着信与行两方面在一个宗教中等量齐观, 在不同的宗教中地位等同,
没有差别。实际上,它们在各个宗教那里所占的比重和地位是不同的。在犹太教与基督
教那里尤其如此。犹太教与基督教皆信仰上帝。然而,犹太教不尚信条和教义,其核心
是“行”,可谓尚行之教;而基督教则把信仰放在首位,主张“因信称义”,可以说是
尚信之教。而犹太教之尚行与基督教之尚信,绝非无缘无故,实乃基本宗教信仰之不同
使然。迄今,国内学术界对这一主题论之不多。本文不揣冒昧,拟阐述犹太教的信行观
并与基督教做适当比较,借以从一个侧面理解和把握犹太教的本质和独特价值。
一、犹太教:信仰与信条
众所周知,犹太教的经典首推《圣经》,其次为《圣传》,即《塔木德》。 《圣经》
中最重要的是《摩西五经》;《圣传》中最重要的是《密西纳》。说它们最重要,是因
为二者皆为犹太教的基本内容——《律法书》。《创世记》开宗明义讲上帝创造天地、
万物和人类,然后描述亚当和夏娃的堕落,挪亚方舟... 阅读全帖
j*******7
发帖数: 6300
9
来自主题: TrustInJesus版 - 数学是中立的吗?
─Vern S. Poythress文章的摘录
章云雄
一般福音派基督徒常以科学证据的中立性出发,为基督教辩护;其实,连做为自然科学
基础的数学本身都不是中立的。普卓思(Vern S. Poythress)是西敏斯特神学院的释经
学教授,拥有哈佛大学数学系的博士学位,他曾经写过一篇有关数学的文章(“A
Biblical View of Mathematics” in Foundations of Christian Scholarship:
Essays in the Van Til Perspective. Vallecito, California: Ross House Books,
1976)处理以下两项关键性的问题:(一) 对基督徒与非基督徒而言,数学这个学科是否
是中立的(即不受宗教信仰影响)? (二) 如果不是中立的,什麽是基督徒的数学观?
(一)
宗教信仰与数学有关吗?普教授很肯定地答道:当然有关!人对算术、证明的标准、数
学公理是否存在等问题的理解,都受到他的信仰的影响。就算术而言,不是所有的人都
接受2+2=4的!一个人必须先接受多元的世界观,才能接纳这道数学公... 阅读全帖
a*****y
发帖数: 33185
10
来自主题: Wisdom版 - [世间智]归纳法怀疑论ZZ
归纳法怀疑论
推论可分两大类,一类演绎(deduction),一类归纳(induction)。归纳法又可再分两
大类,一类是质的归纳(qualitative induction),一类是量的归纳(quantitative
induction)。量的归纳如机率统计,质的归纳如穆勒(John Stuart Mill,1806-1873)
的归纳、模拟归纳(Induction by analogy)和简单枚举归纳。不难想象,我们日常生活
中几乎没有不用推论的时候。更进一步说,我们在生活中几乎无可避免要用归纳推论。
为甚么我们会相 信太阳明天会从东方升起?因为我们观察到无数次太阳从东方升起,
而且从未观察到太阳于东方以外的方位升起。为甚么我们不会认为自己从高空掉到地上
还能生 存?因为我们观察到(直接或间接)许多次有人从高空掉到地面死亡,而且从
未观察到有人从高空掉到地上却没死。为甚么你打开计算机屏幕时要按那个按钮?因为
你 在过去观察到无数次按那个按钮后屏幕打开,并且从未试过按那个开关后屏幕没打
开(在有插电源的情况下,其它特殊情况不赘)。凡此种种,都是简单枚举归纳法 的
实际应用。
多年几... 阅读全帖
a*****y
发帖数: 33185
11
然后对于逻辑加实证的方法论,你有考虑过归纳法怀疑论的问题吗?
=============================================================================
歸納法懷疑論
推論可分兩大類,一類演繹(deduction),一類歸納(induction)。歸納法又可再分兩大
類,一類是質的歸納(qualitative induction),一類是量的歸納(quantitative
induction)。量的歸納如機率統計,質的歸納如穆勒(John Stuart Mill,1806-1873)
的歸納、類比歸納(Induction by analogy)和簡單枚舉歸納。不難想像,我們日常生活
中幾乎沒有不用推論的時候。更進一步說,我們在生活中幾乎無可避免要用歸納推論。
為甚麼我們會相信太陽明天會從東方昇起?因為我們觀察到無數次太陽從東方昇起,而
且從未觀察到太陽於東方以外的方位昇起。為甚麼我們不會認為自己從高空掉到地上還
能生存?因為我們觀察到(直接或間接)許多次有人從高空掉到地面死亡,而且從未觀
察到有人從高空掉到地上卻沒死。為甚... 阅读全帖
a*****y
发帖数: 33185
12
来自主题: Wisdom版 - Philosophical zombie--Wiki
1. The idea of zombies
Descartes held that non-human animals are automata: their behavior is
explicable wholly in terms of physical mechanisms. He explored the idea of a
machine which looked and behaved like a human being. Knowing only
seventeenth century technology, he thought two things would unmask such a
machine: it could not use language creatively rather than producing
stereotyped responses, and it could not produce appropriate non-verbal
behavior in arbitrarily various situations (Discour... 阅读全帖
f*******e
发帖数: 5594
13
所谓逻辑的先验,后验只是一种分类而已。先验(a priori ;也译作 先天)在拉丁文
中指“来自先前的东西”,或稍稍引申指“在经验之前”。近代西方传统中,认为先验
指无需经验或先于经验获得的知识。它通常与后验知识相比较,后验意指“在经验之后
”,需要经验。这一区分来自于中世纪逻辑所区分的两种论证,从原因到结果的论证称
为“先验的”,而从结果到原因的论证称为“后验的”(a posteriori)。
那么先验虽然定义说在经验之前,可是,之前是什么?这有变成鸡生蛋,蛋生鸡的问题
了。
就比如你说的同一律,当然也是经验的产物。我们的意识本身就是这个自然界的一部分
,意识当中有本来的认知,这样的认知也是来源于自然界的。这个就是我们常说的
nature和nurture.
d*****n
发帖数: 599
14
那当然了,列举再多的论文和获奖,在华理人眼里,尤其是普通xsu人里面,都没有洁
净煤内部人士上来说一句来的权威。
那我们看看美国的,搞化工基础研究的,有代表性的一些教授的好文章。
A priori prediction of adsorption isotherm parameters and chromatographic
behavior in ion-exchange systems
Steven M. Cramer发表在PNAS。这就是一片数学文章。
当然目前风头最劲的,还是UCLA的james liao。他nature, PNAS跟灌水一样,都是数学
模型。一排排的数学模型。搞到什么程度那,还自己改写了一个matlab的toolbox。
老O之前讲过了,化学化工的最高境界,就是从化学的本质认识,上升到一个数学描述
。凡是有类似贡献的,都是将来美国工程院院士的种子选手。
那这就需要至少化学和数学都强大。在美国,东岸是mit, princeton,之类的。南方是
UT austin。西岸是UCLA, Berkeley, Caltech。他们院士多,年纪轻,也是没办法的事
情。客观
f**k
发帖数: 906
15
来自主题: HUST版 - [合集] help needed
☆─────────────────────────────────────☆
sambeckgg (hustetp) 于 (Fri May 13 16:55:50 2005) 提到:
How are you guys doing?
I am looking for two ph.d students for Fall 2005 on behalf of my advisor. As
the time is limited, please do me a favor to spread it to your friends and
colleagues ASAP. Here is the requirement:
Major: Numerical heat transfer or related majors such as thermodynamics.
Priori: graduate students with articles issued on journals or conferences.
My advisor will provide the ph.d stu
l**n
发帖数: 7272
16
应该是。如果店里有N个app,下载某个app的概率是1/N如果没有a priori information。
b*******f
发帖数: 75
g*****g
发帖数: 34805
18
傻逼你不死撑没完是吧?给你看看http spec.
3.2.1 General Syntax
The HTTP protocol does not place any a priori limit on the length of a URI.
Servers MUST be able to handle the URI of any resource they serve, and
SHOULD be able to handle URIs of unbounded length if they provide GET-based
forms that could generate such URIs. A server SHOULD return 414 (Request-URI
Too Long) status if a URI is longer than the server can handle (see section
10.4.15).
f********x
发帖数: 99
19
The world beyond batch: Streaming 101: A high-level tour of modern data-
processing concept
http://radar.oreilly.com/2015/08/the-world-beyond-batch-streami
by Tyler Akidau August 5, 2015
Editor’s note: This is the first post in a two-part series about the
evolution of data processing, with a focus on streaming systems, unbounded
data sets, and the future of big data.
Streaming data processing is a big deal in big data these days, and for good
reasons. Amongst them:
Businesses crave ever more tim... 阅读全帖
L****8
发帖数: 3938
20
来自主题: Programming版 - 从数据压缩角度理解CNN
最高级的应该是 model based compression
CNN最近几年研究 很多文章都是说学习出来了各种模型参数
比如pose 笑脸 苦练 等等 对应最后一层卷积出来的特征
https://www.cs.cmu.edu/~guyb/realworld/compression.pdf
We briefly present one last transform coding scheme, model based compression
. The idea here is to characterize the source data in terms of some strong
underlying model. The popular example here is faces. We might devise
a general model of human faces, describing them in terms of
anatomical parameters like nose shape, eye separation, sk... 阅读全帖
b*******f
发帖数: 75
21
rrdw. 谢谢~
S**I
发帖数: 15689
22
用\textit不就得了
f*******e
发帖数: 1300
23
It's possible that you may lose some of your exam credits under the
transition rule if there is a change of exam structure. For example CAS will
start a structure change next year. In some cases you do have to take
additional exams to get extra credits.
I am not sure whether the exam process would impact pregnancy because it
depends on your life priories, exam process and a lot of other
considerations.
How much time needs to be spent on preparing exams varies for different
people, depending on t... 阅读全帖
b*****l
发帖数: 9499
24
来自主题: Biology版 - 统计学在系统生物学的作用
比如说,三个策略,第一个策略是寻找 DEGs,那么每个 gene 都是独立的;第二个策
略是寻找 pathway,那么一系列的基因就是相互联系的;第三个策略是寻找 gene
expression pattern,这些基因也是相互联系的,但其机制有可能已知,有可能未知。
第二种策略是 a priori 的,第三种策略是 posteriori 的。
哪怕第一种策略,也可以寻找 gene-wise 的 pattern,比如说 Wright & Simon 2003
就提出每个 gene 的 std^2 放在一起,服从 Gamma 分布,从而把拟合所得的 Gamma
分布的 a 值拆借到了F-test 里去,或者用来修饰 t-test 的 sigma 的自由度。他们
给的例子中,a = 3.x,也就是说,总共可以拆借 2a = 6.x 到 sample size 去。考虑
到做 microarrays 时 n 一般也就 3-5,这个拆借过来的值已经很可观了。
t*d
发帖数: 1290
25
参考一下这个:
A major problem with validating RNA-Seq expression estimates is that there
is no clear 'gold standard' for expression estimation. Comparison of RNA-Seq
to microarrays has suggested that the former technology is more accurate
than the latter. We examined the recently published NanoString nCounter gene
expression system, but noticed many unexplainable outliers and high
variance between technical replicates (see Figure S4 of Additional file 1
and data in Additional file 2). Quantitative rev... 阅读全帖
s*****0
发帖数: 244
26
来自主题: Biology版 - 求篇paper
Nature Reviews Cardiology 6, 337-348 (May 2009)
Sodium channel mutations and arrhythmias
Yanfei Ruan, Nian Liu & Silvia G. Priori
s*****[email protected]
万分感谢.
l******n
发帖数: 298
27
把你的拒信打开第二页有签名,是谁就是谁这也用猜吗?
Karin Bornfeldt
William M. Chilian
Stefanie Dimmeler
Kathy Griendling
Joshua Hare
Jose Jalife
Walter J. Koch
Issei Komuro
Silvia Priori
Paul Ridker
William Sessa
Alan Tall
c****n
发帖数: 21367
28
来自主题: ChineseMed版 - 中医的发展与继承
另外,个人觉得中医不是hypothesis-driven。写点理由,请多多批评指正啊。
中医并没有拿哪个命题过来做null test,而且其测试不是planned priori的。
基本上应该是exploratory。但我不同意exploratory是subjective的说法。
实际上,大数据量的dataset一抽象,模型自己就出来了。最简单的例子
就是PCA,取empirical covariance矩阵的特征方向来刻画dataset。
可以达到最小维数的目的。
抽象的说,就是先从数据中直接算出坐标轴,根据算出来的坐标轴来刻画
因果关系,而不是先假设一个因果关系,然后去检验了再依据检验结果
制订坐标轴来刻画dataset。中医用的是前一种方法。
放到生物学里面的例子就是。别先假设存在一个白化病基因是遗传物质然后
分显性隐性,再通过null test找基因什么的。拿几千几万个人的数据来,
数据分析一下就看到爹妈是什么情况子代会是什么情况了。算出来的结果不会
导致人类发现基因,但是会直接得出显+隐=显,隐+隐=隐,显+显=显的关系
(粗糙的这么说遗传关系,只是举个例子)。
然后说关于这
r****y
发帖数: 1437
29
来自主题: Computation版 - 怎么解这个方程组阿

maybe this works
let a priori covariance matrix as
Sa = diag{0.25, 0.25, ...}
first guess [0.5, 0.5, ...]
minimize
(y-Kx)'(y-Kx) + x'Sax
w*****g
发帖数: 47
30
来自主题: Economics版 - multi-market(category) competition
get some sense(or idea) on multi(actually two) market competition, in which
product differentions are on both the horizional and vertical line, and demand
correlation across markets can be derived analytically instead of assumd a
priori or derived empirically. does any one have interest in this stuff? and is
this done by some others already?
search by "vertical differentiation", and find what people have talked about
is mainly about quality differentiation and consumer self-selection of quality
b*******f
发帖数: 75
X*****r
发帖数: 2521
32
这个是啥玩意
n*******d
发帖数: 650
33
用斜体 \i{}
b******n
发帖数: 147
34
来自主题: Mathematics版 - Help, please...DCT error analysis
I meet a big problem about the DCT error analysis in my research.
For a discrete funtion f(i), i=0,1,...,n-1, I use the discrete cosine
transform to approximate it, which means calculate m coefficients and
approximate f(i) as f_m(x) where x=0,1,...,n-1. We know that only infinite
coefficients can approximate the original discrete function f(i) without any
error.But now since we only used m coefficients, some errors are introduced.
My problem is, how to calculate such error without any priori kno
F*******n
发帖数: 8
35
The absolute worst talk (once again, expositorily speaking) was by Gang Tian
. Here there was no room at all for productive day-dreaming. Tian's talk was
extremely technical, very dry, and the transparencies were typed with small
font, that probably made it hard to follow even for the ten or whatever
experts in the audience.
Appendix to Opinion 48: Impressions From The International Congress of
Mathematicians 2002 (ICM 2002, Beijing , Aug. 20-29):
By Doron Zeilberger
Written: Oct. 10, 2002
http:... 阅读全帖
t********y
发帖数: 166
36
来自主题: Mathematics版 - Cauchy-Schwartz的本质是什么?
dual space和几何有关?...我不清楚。
我只熟悉在找上限的时候经常会用到Holder
比如a priori
或者embedding
哦对了
三角不等式的证明会用到Holder
至少我看到的用了...
s*h
发帖数: 1538
37
来自主题: MedicalCareer版 - Program Director谈Personal Statement
Carib grad and a borderline pass on the Steps essentially rules out anything
competitive for you...Gen Surg, Gas, EM and even most IM and Peds programs
are pretty much not going to happen for you. You can certainly go the "
multiple surgery prelim years" route and hope for the best, but every year
that you're out of school without a match makes you less and less
competitive. Carib grads need good (220+) Step scores to get a mediocre
residency spot and need stellar (250+) scores for a good spot o... 阅读全帖

发帖数: 1
38
(方舟子按:近年来国外医学期刊多次发表国外临床试验结果否定了肖氏手术的有效性
。霍普金斯儿童医院最近在美国《神经外科杂志:儿科》发表几年前对肖氏手术做随机
双盲对照试验的结果,结论还是:毫无效果,不可用于临床,在做进一步的基础研究和
动物实验之前,不应再对肖氏手术做临床试验。这是最新的也是最严格(首次使用对照
)的一项研究结果,称得上是肖氏手术的最后一颗棺材钉。《神经外科杂志:儿科》同
时发表社论揭露肖传国的底细,以下是该社论的翻译,原题《社论:一个负面研究的正
面意义》)
http://thejns.org/doi/pdf/10.3171/2015.10.PEDS15271
http://fangzhouzi.baijia.baidu.com/article/440220
http://fangzhouzi.baijia.baidu.com/article/435841
作者:Andrew Jea, MD
贝勒医学院神经外科系、得克萨斯儿童医院儿科神经外科部
2016年5月3日
佛罗里达州圣彼得堡的约翰森·霍普金斯儿童医院Gerald Tuite博士及其同事提交了一
项重要的研究结果... 阅读全帖
c****e
发帖数: 2097
39
few comments

a pt. is a space.
plus, there is space in QM, to even begin normalize your wavefunctions, for
example, you'll need it.
to use language popularized by string theory, it's the worldvolume that's 0
dimensional for QM. a 0-brane (D-instanton) still has a target space which a
priori has arbitrary space dimensions.
Corithian(?) was right, as well as you are, there's a difference between a (
generalized) eigen-"function" of a Hermitian operator and a state of the
Hilbert space. the delta
c****e
发帖数: 2097
40
来自主题: Physics版 - T D LEE 的八卦
yep, you're right
i meant something like this: whether the ew theory is su(2)xu(1) or su(2)xsu
(2) won't a priori upset any theorist if either case turns out true.
a different category of problems are for example if the space dimension turn
out to be 4 instead of 3. this will be more significant
while particle physics had been intensively studied in the past, it seems
not to be where new mysteries lie.
n*********3
发帖数: 21
41
来自主题: Quant版 - PCA and how to estimate sigmas
You are given data for 10 different columns and 501 days (say 501*10
array). It is assumed that the prices satisfy the model:
dS_k =\SUM_{j=1}^r\sigma_(kj)dW_j k = 1, . . . , 10
where {W_j(t)} are independent Brownian motions. The number r is unknown a
priori. Using PCA method in MATLAB determine r and estimate the
coefficients {\sigma_(kj)}.
From PCA, now I have got r = 2. hence:
dS_k = \sigma_{k1}dW_1 + \sigma_{k2}dW_2, k=1,2,...10
How can I proceed to estimate the sigmas...
x********9
发帖数: 31
42
来自主题: Quant版 - 请教一道概率题。
The answer is [-1,1]. The only requirement is that the matrix \Sigma
\begin{bmatrix}
1 & a & a \\
a & 1 & a \\
a & a & 1
\end{bmatrix} is positive definite.
For any X, X^{\top} \Sigma X is equal to \frac{a}{2}(x_1+x_2+x_3)^2 + (1-\
frac{a}{2})(x_1^2+x_2^2+x_3^2) or -\frac{a}{2}(x_1+x_2+x_3)^2 + (1+\frac{a}{
2})(x_1^2+x_2^2+x_3^2)
Both expressions are positive when a \in [-1,+1]
The reasoning using 3 dimension space is obviously wrong. A priori choosing
three random variables is to choose three ... 阅读全帖
mw
发帖数: 525
43
来自主题: Quant版 - 收到一个phone interview
i guess it is alright
there are plenty of desks within GS. Quite often people got intereviews from
3 or 4 different teams in GS.
GS is definitely a big name, but not necessarily the best place to be for
you. If you have to screw up the first few interviews, i guess you don't
have any 'a priori' info here for your decision
So just go for it
hoping this could help
s*********y
发帖数: 284
44
Assume a priori the probability of S poisoning is p, then by Bayes rule:
p(S poison|A,B)=0.7*0.8*p/(0.7*0.8*p + 0.3*0.2*(1-p))
=28p/(3+25p)
assuming specificity is the same as sensitivity
then the probability is 1-p(S poison|A,B)=(3-3p)/(3+25p)
for example if we assume p=0.5 then we can plug into the formula

no
f*******r
发帖数: 257
45
As I understand it, if x and y are cointegrated, then ols is consistent.
Nothing needs to be done other than ols. But a cointegration test needs to
be done a priori.
If x is i(1), then y on diff(x) can be regressed by ols. However, many
times it's not meaningful to regress y on diff(x)...
n*****s
发帖数: 10232
46
来自主题: Statistics版 - how do you deal with sparse data?
这个post作者介绍用bootstrap方法,缺点之一是这样就没有一个单一的model。看到下
面一个人的回复,我感觉更感兴趣
“I’ve built models with 90/10, 95/5 or worse without resampling with good
success whether using logistic regression, neural networks, or some kinds of
trees. The key is thresholding the posterior probability estimate from the
model at the level of the a priori probability (if you want to compute
classification accuracy or use confusion matrices). ”
我好像没用过这个prior/post probability的方法(是bayesian?)。这里说的
classification accuracy和confusion
c***z
发帖数: 6348
47
来自主题: Statistics版 - Random forests on imbalanced data (转载)
【 以下文字转载自 DataSciences 讨论区 】
发信人: chaoz (面朝大海,吃碗凉皮), 信区: DataSciences
标 题: Random forests on imbalanced data
发信站: BBS 未名空间站 (Fri Jun 20 12:54:36 2014, 美东)
Recently I used RF for imbalanced data (10% positive, 90% negative) and I
played with several tricks. Below are the comparison of results. We are most
concerned about false negatives.
Any comments and suggestions are extremely welcome!
1. vanilla version:
> randomForest(Relevant ~ ., data = train, ntree = 1000)
# prediction_1a FALSE TRUE
# a... 阅读全帖
H****r
发帖数: 16240
48
投诉人:Hetzer
投诉对象:goodegg
投诉标题: 投诉Chinanews版主goodegg利用职权党同伐异纵容辱骂性言论
投诉目标:goodegg下台
投诉理由:goodegg严重偏袒部分反华ID;今日priori在chinanews版号召扰乱军事版正
常讨论秩序,puccini随即对军事版发表辱骂性言论:
http://mitbbs.com/article/ChinaNews/31246341_3.html
发信人: puccini (小灰驴·转朱阁低绮户照无眠), 信区: ChinaNews
标 题: Re: 眼下这么多人看军版不顺眼,不如这样
发信站: BBS 未名空间站 (Tue Mar 11 02:17:24 2008), 转信
军版本来就是yy狂的聚居场所,留着让他们自己去抽疯吧
goodegg在接到我对puccini的投诉以后
http://www.mitbbs.com/article3/ChinaNews/31246811_3_tp.html
宣称:无特定攻击攻击对象的不封
http://www.mitbbs.com/article/ChinaNews/
A*******e
发帖数: 12486
49
我觉得你这个说法不妥。zhengzhuer开启“言语粗俗标题贴”和“针对个人的无关话题
贴”,这个性质至少构成“发表不恰当文章”啊,按军站的尺度理应取消其言权14天,
怎么能只关5天就放了呢?岂有此理!
发信人: deliver (自动发信系统), 信区:
标 题: roseriver 封 analyticity 在 Military 版
发信站: BBS 未名空间站自动发信系统 (Mon Feb 8 14:36:01 2010)
【此篇文章是由自动发信系统所张贴】
由于 analyticity 在 Military 版的 发表不恰当文章 行为,
被暂时取消在本版的发文权力 14 天。
备注:priori马甲
版主:roseriver
Mon Feb 8 14:35:35 2010
发信人: deliver (自动发信系统), 信区:
标 题: roseriver 封 yangweiqun 在 Military 版
发信站: BBS 未名空间站自动发信系统 (
首页 上页 1 2 3 4 5 6 7 下页 末页 (共7页)