s*********x
发帖数: 1923 | 1 一般都用Euclidean Distance吧。
好？ |
|
R********0
发帖数: 780 | 2 如果数据点的数量级差别比较大，没有normalization的话，用Euclidean Distance会
不合适 |
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a****m
发帖数: 693 | 3 normalization应当是指把所有的基因，或者变量放在一个尺度上，也就是一个变量之
内的sample为standarized normal,否则euclidean distance 不合适。
还是用correlation，与变量的尺度无关。 |
|
h*******o
发帖数: 4884 | 4 麻烦能不能再解释的清楚一点
我现在的case是就2个group, ctrl 和Treatment
用得actin+GAPDH做得internal control
所有其他的target 都normalize了
然后软件又给出了treatment group的fold change和P value
做cluster/heatmap的时候，有2个选择一个是Pearson Correlation一个是Euclidean
distance.
因为我就2个group，所以我想看看每个group的individual sample怎么cluster
发现不管用那个方法，图都还行，每组6个sample里面5个都cluster在一起，只有一个
会跳到另外一组的sample中间
但是pearson 和Euclidean的差别在于 不同的target gene被放在一起了
这个有区别吗？
谢谢 |
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C***U
发帖数: 2406 | 5 就是给两个sequence x和y， 计算x和y之间的edit distance
谢谢 |
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P*********y
发帖数: 986 | 6 半价转让ASMS的Hotel
Hotel名字是HOMEWOOD SUITES by Hilton, BALTIMORE inner harbor, walking
distance to convention center
原价是$189/day＋tax
check in 6/14/2014, check out 6/20/2014
ask for $100/day.
感兴趣请站内短信 |
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s*****2
发帖数: 68 | 7 想找学费不贵的学校念一个master degree, distance education 的，mechanical
engineering 或 materials science, 大家可有介绍？谢谢 |
|
s***e
发帖数: 911 | 8 From page 11, (2.21), you can derive out the general distribution of
end-to-end distance, phi(|R|, N). All the higher moments can be derived from
here by integration over |R|^i * phi(|R|,N), d |R|. These integrations over
|R| should be simple. |
|
s***e
发帖数: 911 | 9 Suppose the chain has N segments connecting N+1 points. The distance between
points i and j follows the distribution phi(r_ij, j-i). can be
calculated from the distribution. The radius of gyration is then:
R_G^2=Sum_{i,j} /(N+1)^2 |
|
w**a
发帖数: 1024 | 10 you can look for the latitude/longitude
then calculate the distance. |
|
F******n
发帖数: 160 | 11 Hello all,
I am looking for the references on the distance measure of two matrices,
both of which are positive definite and symmetric. For the unknown space (e
.g., non-Euclidean), I heard that the general mathematical treatment is
somehow related to Riemannian manifolds, and the problem could be further
formulated and boiled down to the generalized eigenvalue problem. I am
looking for the detailed reference papers/books to explain this approach.
Thanks very much in advance!
feyn |
|
w**a
发帖数: 1024 | 12 prove the distance between 2 disjoint compact sets > 0. |
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e**c
发帖数: 195 | 13 这个K-nearest neighbor distance就是一个点到离它最近的第K个点的
距离。听说这个距离(在某种条件下)服从正态分布，但我在网上找
了很久也没有找到相关文献，请问有没有哪位高人给指点一些相关
的文章或是文献，多谢。 |
|
s*******y
发帖数: 558 | 14 Given n points and an integer k, how to find k point out of these n
points, such that the sum of the pairwise distances of these k points
are the maximal?
I guess this is an NP-hard problem. Are there any approximation algorithms
in the literature with error analysis?
thanks |
|
A*******r
发帖数: 768 | 15 max 1/2 x^T Q x
s.t e^T x = k
x \in \{0,1\}^n
where Q =(q_{ij}) with q_{ij} = the distance b/w i and j
For more details, google
pseudo Boolean optimization.
【
在 starrysky (冰糖葫芦_爱可不可以永远幸福没有悲伤) 的大作中提到: 】 |
|
l******9
发帖数: 579 | 16 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: data clustering by vector correlation distance
发信站: BBS 未名空间站 (Wed Feb 26 11:17:21 2014, 美东)
I am working on data analysis.
Given a group of data vectors, each of them has the same dimension. Each
element in a vector is a floating point number.
V1 [ , , , … ]
V2[ , , , … ]
...
Vn [ , , , … ]
Suppose that each vector has M numbers. M can be 10000.
n can be 200.
I need to find out how to partition the n vector... 阅读全帖 |
|
b****t
发帖数: 11 | 17 Nanoparticles分布在一个平面上，
不是perfect lattice，但是locally ordered
有没有什么软件可以计算和统计NP的nearest neighbor distance？ |
|
|
g****l
发帖数: 15 | 19 It was said the programm require 4 years (total 9 semesters) professional
education. SO, the 4 years tuition 13,193*9 = $181,737
I think the only problem is: If the program accepts Chinese 4 years bachlor
degree(transcripts) as pre-pharmacy ? I checked some other PharmD non-
istance programms, they didn't accept forign country's bachlor transcripts
as pre-pharmacy, they only accept American and Canada transcripts. For
this distance one, maybe need ask for them and make sure. |
|
f****b
发帖数: 2410 | 20 non-trdational pharm D
http://pharmd.distancelearning.ufl.edu/
over 100 a year graduates since 1994
Over 1,600 Working Professional Pharm.D. Graduates
Established in 1994, the University of Florida's Working Professional Doctor
of Pharmacy program is one of the most established non-traditional Pharm.D.
programs. As a student, you will become part of a network of dynamic
faculty, over 500 students, and 1,600 working professional graduates.
Distance Learning Degree Program
The University of Florid... 阅读全帖 |
|
c*****t
发帖数: 198 | 21 There are two kinds of particles in solution and how to detect the distance
distribution between these two kinds of particles? Thank you very much. |
|
R*******N
发帖数: 7494 | 22 CHICAGO (Reuters) - U.S. physicists have coaxed tiny artificial atoms into
communicating in an advance that may lead to super-fast quantum computers,
the researchers said on Wednesday.
Quantum computers hold the promise of being enormously powerful, capable of
solving in seconds problems that take today's fastest machines years to
crack.
So far, physicists have worked mostly on developing the most basic of
elements that can store information known as quantum bits, or qubits.
But a series of pape... 阅读全帖 |
|
N******e
发帖数: 81 | 23 写信给用过power distance 和 high/low context的measures的两个作者回信，
没有回音，因为比较急，来这里碰碰运气吧。
有没有做跨文化研究的同学用过这两个measures, 可否分享，或者指点哪里去找？
谢了。//bow |
|
l******9
发帖数: 579 | 24 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: data clustering by vector correlation distance
发信站: BBS 未名空间站 (Wed Feb 26 11:17:21 2014, 美东)
I am working on data analysis.
Given a group of data vectors, each of them has the same dimension. Each
element in a vector is a floating point number.
V1 [ , , , … ]
V2[ , , , … ]
...
Vn [ , , , … ]
Suppose that each vector has M numbers. M can be 10000.
n can be 200.
I need to find out how to partition the n vector... 阅读全帖 |
|
a***w
发帖数: 30 | 25 The distance between two distribution funcion,
related with entropy or relative entropy:
D(p||q)=\sum_{x\in\Xc}{p(x)log(\frac{p(x)}{q(x)})} |
|
j***g
发帖数: 27 | 26 有朋友想在课余时间修个硕士，请大家推荐几个online distance biosta/sta ms
program，这些online program跟一般的硕士最后证书上有区别吗？谢谢 |
|
l*****l
发帖数: 4170 | 27 Jaffe (1986, AER) 有个很有名的tech distance measure，不知道哪位大侠能share一
下sas
codes? 谢谢！ |
|
R******d
发帖数: 1436 | 28 PROC DISTANCE输出的距离矩阵的格式默认如下：
id _1 _2 _3
1 0
2 11 0
3 21 31 0
请问如何能让其输出为：
1 2 11
1 3 21
2 3 31
多谢了 |
|
s*r
发帖数: 2757 | 29 what if we want the squared difference? distances cannot be negative |
|
R******d
发帖数: 1436 | 30 再问一句，同样的数据，用不同的distance method算出来的结果没有相关性是不是正
常的？
多谢了 |
|
l******9
发帖数: 579 | 31 Thanks,
But, in clustering, each data piont is a scalar (a number).
In my problem, each data piont is a vector that contains a group of numbers.
The distance between two vectors is a the linear correlation of teh two
vectors not two data points in the two vectors.
Example,
v1 = [1, 2, 3]
v2 = [4, 6, 8]
v3 = [10, 5, 9]
v1 and v2 has strong correlation than v1 and v3 or v2 and v3.
So,, v1 and v2 should be put in the same cluster but v3 cannot be.
Any help would be appreciated. |
|
h***x
发帖数: 586 | 32 1) As catforfish said, the data point is not necessary to be a scalar, a
vector is fine. All my work on clustering are for multi dimension instead of
one dimension. I suggest you spending some time to learn clustering first.
2)In your example, v1 and v2 has strong correlation. If you want to take
this into account in clustering, you should not use euclidean distance as
the statistical measure, you can use other measures with the features you
like for your task.
3)For clustering, result explanati... 阅读全帖 |
|
i**********n
发帖数: 217 | 33 what is your purpose?
You can either normalized variables first,
or use cos like distance. |
|
s***i
发帖数: 114 | 34 Location:Gaithersburg/Quince Orchard Blvd
Cost: 2bed/1bath condo for $1150(inlcude all utilities)
Contact: m***********[email protected] or 240-672-4586
Nice condo(2 bed/1bath) in a quiet, safe and friendly community located in
Quince Orchard Blvd with Zip code 20878. Current tenants will move out
middle of July, after around two week's renovation it will be available end
of July.
--Two bedrooms with 1 bathroom;
--All utilities are included in the rent(gas, electricity and water);
--2nd floor with bal... 阅读全帖 |
|
w***n
发帖数: 9040 | 35 Registration Confirmation for:
2012 Chicago Triathlon, Fleet Feet Super Sprint, and Chicago Kids Triathlon
Dear Yan,
Congratulations! You are now officially entered into the International
Distance for the Chicago Triathlon, taking place on Sunday, August 26th,
2012. Please retain this confirmation for your records.
There are no refunds for any of the events during the Chicago Triathlon
weekend. If you are unable to compete due to illness or injury, you may
qualify for a medical transfer to next ... 阅读全帖 |
|
i*********5
发帖数: 19210 | 36 我觉得你现在就可以上oly distance了！ |
|
b*******l
发帖数: 171 | 37 heng heng, long distance needs long way to maintain ma |
|
b*******l
发帖数: 171 | 38 heng heng, long distance needs long way to maintain ma |
|
m******r
发帖数: 9604 | 39 有ironman的是WTC办的，其他的不是WTC的比赛
Saturday, February 27, 2010 Ironman Langkawi Malaysia Triathlon
Langkawi, Malaysia Langkawi, Malaysia
Saturday, March 06, 2010 Ironman New Zealand
Taupo, New Zealand Taupo, New Zealand
Sunday, March 14, 2010 Ironman China (NOT OFFICIAL YET, THE 2011 EVENT WILL
BE MOVED TO TIANJIN IN MAY 2011)
Haikou, Hainan, China Haikou, Hainan, China
Sunday, March 28, 2010 Ironman Australia Triathlon
Port Macquarie, New South Wales Port Macquarie, N.S.W., Australia
Sunday, Apri... 阅读全帖 |
|
m******h
发帖数: 5753 | 40 short cast 我不看线， 没有问题，但distance cast 不回头看的话总是cast不远。 |
|
b**s
发帖数: 4571 | 41 distance casting一般专指那种14尺长杆，钟摆加速，扔个200米距离的远投比赛 :-)))
fly fishing, 如果你追求距离，那你要练double haul或者shooting head. |
|
M********e
发帖数: 2528 | 42 这个long distance在10几年前，那个没有手机，没有网络的时代。
A在北京，B在大连。
都住着热闹拥挤的大学宿舍，每个宿舍楼只有一部电话。
唯一的交流方式是写信，寄出一封信之后就数着天数盼着回信，数的差不多了就催拿信
箱钥匙的同学去取信，按时收到信就会兴高采烈，收不到信就垂头丧气。一个又一个星
期的循环着一样的心情，直到假期的来临
放寒假了，同学聚会上见了一面，人太多太闹，把想象中见面的兴奋冲淡了很多。然后
各自忙着陪父母，过年，那个时候拜年还是要一家一家的拜访过去，远远近近的亲戚都
走了一圈以后，寒假也过了大半
过完了年，B家里没有电话，A如果有事出门，回来以后总是担心是不是错过了某个电话
；如果没事就在家里守着，从早上起床以后开始猜今天会不会接到电话能不能见面，有
时候猜来猜去接到电话就很高兴的一起出去玩儿，有时候猜来猜去一天就过去了。猜着
猜着寒假就结束了。
新学期开始继续鸿雁传书，期间A过生日，收到了B寄来的一套《笑傲江湖》，欣喜若狂
，立刻坐下来写信，写着写着，喜悦的心情慢慢就平淡了，信也写的干干巴巴。A想：其
实心情是有时限的，最感动的时刻不能一起分享就过去了。不 |
|
|
f*****s
发帖数: 2489 | 44 版上这么多long distance成功的例子。。 |
|
t***n
发帖数: 1607 | 45 我也认识一对，高中开始谈恋爱，上大学开始long distance，折腾了8年还是分手了。 |
|
a**u
发帖数: 3802 | 46 恩，我觉得我见过的成了的long distance，互相还是很努力能够经常见到的，真的好
长好长时间见不到的，真的不行 |
|
c*********r
发帖数: 19468 | 47 所以制动的进化主要是重量越来越轻，散热越来越好，没有比拼你最大制动功率多少多
少，我最大制动功率多少多少的，因为归根结底还是取决于轮胎。好的制动比较轻，降
低非簧载质量，散热好，耐高温，不容易失效，这就是优势。
转向的问题，很简单，轮胎抱死后没有了转动，轮胎和地面的接触区域就无所谓朝向，
只是一个面而已，你说怎么可能转向呢？
rotor
abs
distance |
|
w*******y
发帖数: 60932 | 48 frys has ooma Core Hub & Scout VoIP System (no monthly fees,Free Long
Distance forever):
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for $170 + SH
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