A*********u
发帖数: 8976 | 1 lag的值不一定是上一个observation里的值
而是上次执行lag function时候的那个值
所以即使是第一个id你也要用一次lag
像这种多个id的情况
可以这么写
data new;
set test;
by id;
last=lag(sumnb);
if first.id then diff=.;
else diff=sumnb-last;
drop last;
run; |
|
A**t
发帖数: 732 | 2 刚开始学SAS，知道了怎么在各个observation里作各variable之间的加减乘除，但不知
到怎么算一个column的和。不知道讲清楚没，谢谢了 |
|
m******1
发帖数: 19713 | 3 I have a data set like this:
id x
1 0.254
2 0.564
3 0.875
4 0.689
.......
The weight for each observation is x/sum of x's. What is the best way to
calculate it?
Thanks. |
|
b******e
发帖数: 539 | 4 你是要observation number还是要count？ |
|
g******s
发帖数: 18 | 5 Yes, you can use ICC. There are three types of ICCs. You may also use CCC
for intra- and inter-observer variability since there are CCC_inter, CCC_
intra and CCC_total.
If you have the Macro, I don't see why not use it. Anyway, you may also try
proc mixed, but need to output the variance components and calculate either
ICC or CCC.
I recommend that paper AN OVERVIEW ON ASSESSING AGREEMENT WITH CONTINUOUS
MEASUREMENTS by Huiman X. Barnhart on Journal of Biopharmaceutical
Statistics, 17: 529–569, 2 |
|
s********8
发帖数: 50 | 6 data is something like shown below
id eventDay
001 3
002 2
003 4
003 5
004 3
004 4
004 5
004 11
004 20
want to get two more column "start" "stop"
id eventDay start stop
001 3 0 3
002 2 0 2
003 4 0 4
003 5 4 5
004 3 0 3
004 4 3 4
004 5 4 5
004 11 5 11
004 20 11 ... 阅读全帖 |
|
d******g
发帖数: 130 | 7 我知道关于high-dimensional data的很多research是关于p>>n的情况，我理解的是因
为对于variables数量比较大的data,如果observations数量不足，会造成estimation的
问题。诸如题目中描述的data算是high-dimensional么？ |
|
n******0
发帖数: 298 | 8 How to add tick marks for censored observations in Kaplan-Meier plot using
survplot in the Design library in R? Thanks. |
|
x**g
发帖数: 807 | 9 谁有这本书的PDF阿？大包子答谢阿！
analysis of observational health care data using sas |
|
c*********4
发帖数: 3 | 10 如果做一个case-control的研究
有少量数据中间样本既是case又做了control
这样算不算multiple observation这样的结果如果用logistic模型做一个预测
对结果影响打么?
谢谢 |
|
k*********g
发帖数: 212 | 11 谁有这本书的PDF阿？大包子答谢阿！
analysis of observational health care data using sas |
|
D*********Y
发帖数: 3382 | 12 比如indicator=1 for mortality event, 0 for censored observation.
model的时候对这俩的处理有什么不同吗？谢谢。 |
|
p***7
发帖数: 535 | 13 I have a dataset test blow
Obs Variable Method Variances tValue DF Probt
1 age Pooled Equal 1.19 16 0.2522
2 age Satterthwaite Unequal 1.19 14.672 0.2538
Now I want to delete the second observation.
data testpval;
set test;
if df=14.672 then delete;
run;
Why is it not working?
Thanks |
|
s*********h
发帖数: 6288 | 14 I want to select randomly one observation from each group_id.
If it can be done in subqueries, it's even better.
Thanks. |
|
b*********n
发帖数: 2975 | 15 use sample 1 after your code
or generate random number function and order it and top 1 like SAS did
I want to select randomly one observation from each group_id.
If it can be done in subqueries, it's even better.
Thanks. |
|
d*****r
发帖数: 39446 | 16 【此篇文章是由自动发信系统所张贴】
observable 已经成为本俱乐部的正式成员, 特此通知. |
|
d*****r
发帖数: 39446 | 17 【此篇文章是由自动发信系统所张贴】
observable 已经成为本俱乐部的正式成员, 特此通知. |
|
d*****r
发帖数: 39446 | 18 【此篇文章是由自动发信系统所张贴】
observable 申请加入本俱乐部的请求已经通过审批, 成为本俱乐部的正式成员, 特此通知. |
|
j**y
发帖数: 7014 | 19 by Pitbull
Observations, problems, solutions
1. This team is competing and playing hard. They may not be playing smart
all of the time, but they are playing hard.
2. I don’t think Latina is part of the problem, nor do I think the
offensive lineman lack capability to be an excellent O-Line. The raw
materials are there, now. If Latina has a fault its for not having more
influence with the coaching staff in changing schemes (see below).
3. Problem: Clausen is generally a very accurate passer. He is |
|
s******o
发帖数: 298 | 20 New Observations of Early Universe Help Confirm Theories of Formation
By Robert Roy Britt
Senior Science Writer
posted: 11:00 am ET
23 May 2002
The most detailed glimpse ever gained of the early universe shows ripples in
space back before there were any stars. This finding adds support to theories
of how the universe began in an initial Big Bang, inflated rapidly, then
developed the first galaxies.
The new view, imaged in microwave wavelengths not visible to the eye, shows
the earliest fluctuati |
|
s******o
发帖数: 298 | 21 NASA is seeking those willing to spread their love and knowledge of Saturn to
others.
by Vanessa Thomas
Is Saturn your favorite planet? Do you want to share this affection with
others in your community? If so, NASA's looking for you.
In June, the space agency announced its new Saturn Observation Campaign.
According to the program's website, its goal is to "create opportunities for
professional and amateur astronomers to engage the public in the excitement of
the Cassini-Huygens Mission to Saturn |
|
S***n
发帖数: 330 | 22 An American Astronomical Society Meeting Release
A major news announcement issued at an American Astronomical Society meeting
, the premier astronomy conference.
Hubble observed a "blizzard" of particles in a disk around a young star
revealing the process by which planets grow from tiny dust grains. The
particles are as fluffy as snowflakes and are roughly ten times larger than
typical interstellar dust grains. They were detected in a disk encircling
the 12-million-year-old star AU Microscopii. |
|
l**********8
发帖数: 305 | 23
************************************************************
上个完整的LOG， 谢谢大家了
****************************************************************
NOTE: PROCEDURE PRINTTO used (Total process time):
real time 0.00 seconds
cpu time 0.01 seconds
25
26 *-----------------------------------------------------;
27 %macro process(year,yr,file,first,numobs);
28
29 data cartemp;
30 set loc.carl&year.
31 (firsto... 阅读全帖 |
|
l**i
发帖数: 8144 | 24 简单地讲 就是谋事在人 成事在天
认为社会发展沿着某个预定方向发展的理论 都是傻逼理论
--------------------------------------
Anthropic principle
From Wikipedia, the free encyclopedia
In astrophysics and cosmology, the anthropic principle is the philosophical
argument that observations of the physical Universe must be compatible with
the conscious life that observes it. Some proponents of the argument reason
that it explains why the Universe has the age and the fundamental physical
constants necessary to accommodate conscious life. As a ... 阅读全帖 |
|
h***y
发帖数: 834 | 25 ☆─────────────────────────────────────☆
pipi2006 (pipi) 于 (Sun Sep 5 14:03:18 2010, 美东) 提到:
去年我们这群病理新手在这种互相交流中受益匪浅。今年本来hemocell大哥开了个帖子
，却被一些不知所谓的ID给破坏掉了。现在由我在这里再次开一贴，相关的交流都可以
发在这里，谈谈自己的IV，rejection list,经验，消息等等。此外，但凡无关以及不
怀好意的帖子我将不经通知立刻删除，并不予解答，如果认为我行为法西斯的请勿进入
。这个帖子是只为真正需要的同学们准备的。
另外，如果有哪位自告奋勇，可以挑头搞起来内科，儿科，神经，家庭，麻醉等等各科
的相应帖子，请不辞辛劳做起来，益人益己。相关的帖子最好集中在相应标题下，这样
以便查找。
祝今年的同学们好运。
☆─────────────────────────────────────☆
csistough (csistough) 于 (Sun Sep 5 19:31:25 2010, 美东) 提到:
When is too l... 阅读全帖 |
|
d**********o
发帖数: 1321 | 26 报告：Decision Tree
// CS570 05/08/2013
// me~me~me~~!!! Project 4 Decision Trees
Decision Prediction for Robot Decisions
Abstract
In this project, a decision tree algorithm is developed using the ID3
information gain algorithm, and it was implemented using c++ language. The
algorithm selects decision split attributes based on information gain, and
selects the variable with highest information gain from the available
variable attribute open list. The algorithm wil... 阅读全帖 |
|
d**********o
发帖数: 1321 | 27 报告：Decision Tree
// CS570 05/08/2013
// me~me~me~~!!! Project 4 Decision Trees
Decision Prediction for Robot Decisions
Abstract
In this project, a decision tree algorithm is developed using the ID3
information gain algorithm, and it was implemented using c++ language. The
algorithm selects decision split attributes based on information gain, and
selects the variable with highest information gain from the available
variable attribute open list. The algorithm wil... 阅读全帖 |
|
h*****9
发帖数: 6643 | 28 没听说过是你自己无知。这只能说明你是个很容易被骗的无知之徒， 你又要凭你自己的无知骂人，你又无耻了。
揭露 BIG-BANG 是披着科学外衣的宗教，这在10年前就有很多文章了。
THE "BIG BANG" IS JUST RELIGION DISGUISED AS SCIENCE
by Michael Rivero
Once upon a time, a long time ago, there was this guy named Aristotle.
Pretty sharp fellow; he thought up a lot of good things. But, occasionally
he made a mistake.
One mistake he made was to toss an orange up in the air and watch it come
straight back down to his hand. Aristotle reasoned that if he was moving,
the orange would have flown... 阅读全帖 |
|
y********n
发帖数: 2063 | 29 Eldos: do u think we can chop it man?
Bussa Buss: sec
erik102 (Observer): i would say ok and not send the 52 k
Dealer: Bussa Buss has requested TIME
mr_wheel_draw (Observer): he is a pro
Bussa Buss: but ya
Eldos: how can i trust u?
Cjolis (Observer): send him only a chiclete
mr_wheel_draw (Observer): he is very well known
Grindeer37 (Observer): loool
Caliguy38 (Observer): he is david freakin baker
Nice221 (Observer): he has a bracelet
THAY3R (Observer): you can trust him
Bussa Buss: im david "ba... 阅读全帖 |
|
o****o
发帖数: 8077 | 30 作T检验，只需要三个统计量嘛，N,MEAN,STD
先求summarized statistics，再用BY-processing。跑得时间不见得少，不过至少不会
崩溃。而且这个用BY-PROCESSING可以很容易并行，最后合并结果也很容易。
134
135
136 options fullstimer;
137 data class;
138 set sashelp.class;
139 array col{20000};
140 do j=1 to dim(col); col[j]=rannor(0); end;
141 drop j;
142 run;
NOTE: There were 19 observations read from the data set SASHELP.CLASS.
NOTE: The data set WORK.CLASS has 19 observations and 20005 variables.
NOTE: DATA statement used (Total process time):... 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 |
|
g********d
发帖数: 4174 | 33 Jump to…Top of pageAbstractIntroductionMaterials and
methodsResultsDiscussionConclusionAcknowledgementsReferences
Introduction
Top of page
Abstract
Introduction
Materials and methods
Results
Discussion
Conclusion
Acknowledgements
References
The National Blood Services of the UK have, since the early 1980s, asked men
who have ever had sex with men (MSM) to not donate blood. At first, this
action was motivated by the aim of preventing transmission by transfusion of
the infectious agent associated ... 阅读全帖 |
|
m*****g
发帖数: 12253 | 34 ☆─────────────────────────────────────☆
JianlianYi (Air Yi) 于 (Thu Mar 1 19:47:24 2012, 美东) 提到:
发信人: JianlianYi (Air Yi), 信区: NBA
标 题: Shaq-Kobe 16年的恩怨情仇
发信站: BBS 未名空间站 (Thu Mar 1 19:46:29 2012, 美东)
个人档案：
Shaq: Shaquille O'Neal，NBA历史上最有统治力的中锋，7尺1(2.16m)，325磅(147kg)
。1972年出生，1992年NBA状元，被魔术队选中，1995带队进入总决赛。96年转会湖人
，与kobe一起建立湖人王朝(00~02三连冠)，04年总决赛败给五虎将的活塞后，转会热
火，协同年轻的D.Wade拿到2006年总冠军。之后状态下滑，08年转到太阳，09年转到骑
士，10年转到波士顿，11年宣布退役，之后加入TNT和巴克利作伴。
Kobe: Kobe bryant，1978年出生，打PG或者SF，6尺6(1.98m)，205磅(93kg... 阅读全帖 |
|
l**********r
发帖数: 74 | 35 Given the SAS data set WORK.BP
What is the result?
A.
WORK.HIGHBP has 1 observation
WORK.NORMBP has 1 observation
WORK.INVESTBP has 3 observations
B.
WORK.HIGHBP has 1 observation
WORK.NORMBP has 1 observation
WORK.INVESTBP has 4 observations
C.
WORK.HIGHBP has 1 observation
WORK.NORMBP has 1 observation
WORK.INVESTBP has 2 observations
D.
WORK.HIGHBP has 2 observations
WORK.NORMBP has 2 observations
WORK.INVESTBP has 3 observations
答案是A还是B阿？多谢！ |
|
s******g
发帖数: 437 | 36 凑个热闹。
Quora上这个话题是老生常谈。下面链接里这个华裔小哥的回答从逻辑上解释为什么会
这样，觉得比较容易懂。
What's the fundamental reason why the speed of light cannot be broken? Why
does the universe want to preserve the upper barrier on speed of light so
much so that it readily slows down time rather than see the speed barrier
broken?
https://www.quora.com/Whats-the-fundamental-reason-why-the-speed-of-light-
cannot-be-broken-Why-does-the-universe-want-to-preserve-the-upper-barrier-on
-speed-of-light-so-much-so-that-it-readily-slows-down-time... 阅读全帖 |
|
a*****n
发帖数: 5158 | 37 1.0 ROOF COVERINGSAttention Required
The roof has pitched cement tile roofing and the balance of roofing area(s)
has a flat/low slope design covered with built up roofing (asphalt and
gravel). Due to the nature of the flat roof construction water will likely
pond on the roof surface after normal rainfall.
The pitched cement tile roof at upper area appears intact and functional
with lower NE pitched cement tile roof has some cracked/broken tiles
observed at middle SW area.
The asphalt and gravel ... 阅读全帖 |
|
W******e
发帖数: 3319 | 38 1. Introduction
My interest in studying creativity was inspired by the frustrations that I
felt as a student, then as a professor. I wanted to know how I could
encourage creativity in myself, my students, and my colleagues.
Politicians, industrial managers, academic administrators, and other leaders
often say that innovation is critical to the future of civilization, our
country, their company, etc. But in practice, these same people often act as
if innovation is an evil that must be suppressed,... 阅读全帖 |
|
s***e
发帖数: 5242 | 39 by Freeman Dyson
12/2010
In 1946 Subrahmanyan Chandrasekhar gave a talk at the University of Chicago
entitled “The Scientist.” 1 He was then 35 years old, less than halfway
through his life and less than a third of the way through his career as a
scientist, but already he wa reflecting deeply on the meaning and purpose of
his work. His talk was one of a series of public lectures organized by
Robert Hutchins, then the chancellor of the university. The list of speakers
is impressive, and included ... 阅读全帖 |
|
e*******n
发帖数: 872 | 40 原题见
http://www.mitbbs.com/article_t/DataSciences/10029.html
专门开一个贴，尝试逐题解答。本人菜鸟，求大牛指导
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
1. Given a coin you don’t know it’s fair or unfair. Throw it 6 times and
get 1 tail and 5 head. Determine whether it’s fair or not. What’s your
confidence value?
我的答案是：
H0: the coin is fair
Ha: the coin is unfair
X is the number of heads
Rejection region: |X - 3| > 2, i.e., X = 0,1,5,or 6
significance level alpha:
alpha = P(reject H0 | H0 i... 阅读全帖 |
|
b***y
发帖数: 14281 | 41 既然有人争论方的学术水平，就上网搜了一下。应该说这个水平对于一个junior
faculty来说可以算是很牛B了，但是对于老方这种senior的已经搞了一辈子的人来说，
就只能算so so。不要说是院士，离aps fellow的级别也还差了不少。引用率最高的一
篇文章还是95年到了arizona之后跟老外合作的，被引118次，这也是方唯一一篇被引用
上百次的文章。可见方励之89之前确实没有做出过什么重要的工作，他的名声和地位绝
对是靠政治得来的，当然其中部分的也是80年在中国搞科普所得，必须承认科普工作也是
有重要的社会意义的。
(BTW，有人说你这个搜索未必完整。不错，确实不能保证100％毫无遗漏。但是我
用的search engine is THE search engine everybody in this community uses today.
So, if any article is not found by this search engine, sadly, it simply doesn't matter,
because no one would ever n... 阅读全帖 |
|
w******i
发帖数: 1476 | 42 SAS Interview Questions from http://www.sconsig.com/
Very Basic
What SAS statements would you code to read an external raw data file to a DATA
step?
How do you read in the variables that you need?
Are you familiar with special input delimiters? How are they used?
If reading a variable length file with fixed input, how would you prevent SAS
from reading the next record if the last variable didn't have a value?
What is the difference between an informat and a format? Name three informats
or format... 阅读全帖 |
|
a*****g
发帖数: 19398 | 43 长篇文章：Why Do Americans Stink at Math?
When Akihiko Takahashi was a junior in college in 1978, he was like most of
the other students at his university in suburban Tokyo. He had a vague sense
of wanting to accomplish something but no clue what that something should b
e. But that spring he met a man who would become his mentor, and this relati
onship set the course of his entire career.
Takeshi Matsuyama was an elementary-school teacher, but like a small number
of instructors in Japan, he taught no... 阅读全帖 |
|
a*****g
发帖数: 19398 | 44 长篇文章：Why Do Americans Stink at Math?
When Akihiko Takahashi was a junior in college in 1978, he was like most of
the other students at his university in suburban Tokyo. He had a vague sense
of wanting to accomplish something but no clue what that something should b
e. But that spring he met a man who would become his mentor, and this relati
onship set the course of his entire career.
Takeshi Matsuyama was an elementary-school teacher, but like a small number
of instructors in Japan, he taught no... 阅读全帖 |
|
|
|
a*****g
发帖数: 19398 | 47 长篇文章：Why Do Americans Stink at Math?
When Akihiko Takahashi was a junior in college in 1978, he was like most of
the other students at his university in suburban Tokyo. He had a vague sense
of wanting to accomplish something but no clue what that something should b
e. But that spring he met a man who would become his mentor, and this relati
onship set the course of his entire career.
Takeshi Matsuyama was an elementary-school teacher, but like a small number
of instructors in Japan, he taught no... 阅读全帖 |
|
f********x
发帖数: 99 | 48 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 |
|
a*****g
发帖数: 19398 | 49 长篇文章：Why Do Americans Stink at Math?
When Akihiko Takahashi was a junior in college in 1978, he was like most of
the other students at his university in suburban Tokyo. He had a vague sense
of wanting to accomplish something but no clue what that something should b
e. But that spring he met a man who would become his mentor, and this relati
onship set the course of his entire career.
Takeshi Matsuyama was an elementary-school teacher, but like a small number
of instructors in Japan, he taught no... 阅读全帖 |
|
f**d
发帖数: 768 | 50 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 |
|
