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y**3
发帖数: 267 | 2 I was given a linear model which contains patients demographics such as
height weight age etc. Heihgt and weight were treated indenpendent and
significant. But the validation data I was given has BMI instead of Height
and weight. Is it statistically sound if I calculate the coefficient for BMI
using those of height and weight? |
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y**3
发帖数: 267 | 3 thanks for the reponse! Can you explain why? I guess the interaction term of
height and weight is insgnificant. Can we assume height and weight are
independnet, and calculate the parameter for BMI
Unfornately I dont have the original dataset. SO I can refit the original
model using BMI. And The goal is to validate the original model estimated
coefficients |
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y**3
发帖数: 267 | 4 Thanks!
Yes,it makes sense!
I tried out another data set from a different product. The fitted BMI
coefficient is close to the one calculated from those of height and weight,
but all the other estimated coefficient also changed dramatically |
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h*********g
发帖数: 18 | 5 I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to
get the ratio of y over x (Y/X) and also needs to know the SD or SEM of the
ratio. How to calculate the SD or SEM of Y/X? In my data, I can use y1/x1,
or y1/x2 or y1/x3 or y1/x4. x1 is not only related to y1, but can also
related y2 or y3 or y4, (what i mean is I can also use y2/x1 or y3/x1 or y4/
x1)
Please help.
Thanks! |
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F****n
发帖数: 3271 | 6 Suppose I have a linear model of this form:
y = [1/(1+b)]x1 + [c/(1-b)]x2 +e
1. I can identify b,c by estimating 1/(1+b) and c/(1-b) using OLS, right?
2. If so, is it possible to calculate standard errors for b and c, as well
as their p value?
Thanks! |
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F****n
发帖数: 3271 | 7 Thanks! Is it possible to directly obtain SEs from MLE by treating b and c
as parameters and modify the calculation of log likelihood?
to |
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l*****w
发帖数: 344 | 8 Since you guys are mentioning about the RVU, so I google it and would like
to know whether my understanding is correct.
Medicare Conversion Factor (CF) since 2000
$36.6137 (2000), $38.2581 (2001), $36.1992 (2002), $36.7856 (2003), $37.3374
(2004), $37.8975 (2005), $37.8975 (2006),
$37.8975 (2007), $38.0870 (2008), $36.0666 (2009), $36.0791 (1/1/10-5/31/10)
, $36.8729 (6/1/10-12/31/10), and $33.9764
(2011).
2012 Medicare Conversion Factor = $24.6712
Example
Total non-facility RVUs for CPT code 99... 阅读全帖 |
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w*****1
发帖数: 473 | 11 【 以下文字转载自 Statistics 讨论区 】
发信人: wz99331 (dotti), 信区: Statistics
标 题: How to use sas to calculate the power of logistic regressi
发信站: BBS 未名空间站 (Tue Nov 4 11:28:25 2014, 美东)
To generate the statement like "given the sample size we have a %90 chance
of detecting an x percent or some unit difference of incidence of heart
defect between high fat and normal diet group at a p value of 0.05. the
sample size for high fat is 516, for normal diet is 2262. Could anyone help
me? Thanks a lot! |
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w*******y
发帖数: 60932 | 13 Staples has the Ti-84 Plus Silver Edition (more functions than just the Plus
model) for 124.99.Target has the same model on sale for 97.00.I had Staples
price match the target ad and they let me use a 25.00 off 75.00 coupon I
bought (3.99) and I still get the 15.00 easy rebate. 97.00 - 25.00 (coupon)
- 15.00 easy rebate + 3.99 ( price of coupon) = 60.99 after rebate.Pretty
good price for a 130.00 graphing calculator.With the money I saved I bought
the extended warranty for 5.00.
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p****i
发帖数: 6135 | 21 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: bluewater (too old, too cynical), 信区: SanFrancisco
标 题: life expectancy calculator
发信站: BBS 未名空间站 (Tue Aug 10 16:03:05 2010, 美东)
http://www.livingto100.com/ |
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b****e
发帖数: 1180 | 22 Thank you!
but how to triangulate?
and how to calculate aspect ratio, eccentricity and compactness? |
|
k********n
发帖数: 18523 | 23 ☆─────────────────────────────────────☆
kbrhouston (石油工人-一切MM都是普赛，纸老虎) 于 (Sat Nov 5 22:33:29 2011, 美东) 提到:
1来便于查阅
2来便于老牛清水（怕误删）
3便于顶进十大，壮大声势，繁荣古板
4减少肥猫工作（否则他需要花精力查看大家的所有请求贴）
谢谢大家
☆─────────────────────────────────────☆
MB80528 (肥猫(Contrarian)[食MM而肥]) 于 (Mon Nov 7 23:08:16 2011, 美东) 提到:
要最新预测的，
请在此报名股票符号。
打算提供２０到３０个预测。
由最先报名的股票符号开始。
☆─────────────────────────────────────☆
fockugcd (fockugcd) 于 (Mon Nov 7 23:09:47 2011, 美东) 提到:
胖肥猫，是不是永久免费的：）？？？？？？？？？？？？？？？
☆────────────────────... 阅读全帖 |
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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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w******o
发帖数: 726 | 25 Dear Dr XXX,
You are making many incorrect assumptions about the teaching of mathematics
at South H. S. Use of a graphing calculator
is a requirement in all NYS regents courses, as well as AP courses and exams
. In our program it is used as a tool to help
conceptual understanding and not as a "crutch" that impedes understanding.
Joan Casazzone
wrote:
> Dear Ms. Casazzone,
> It is not the financial difficulty, it is the damaging effect to the kid's
brain. I knew that Texas instrument Inc. invi... 阅读全帖 |
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g********d
发帖数: 4174 | 26 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 |
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o**2
发帖数: 168 | 27 前言
===========================================================
FMP的核心理论一直没有变过， 之所以有1.0、2.0、3.0， 是因为分阶段推广的原因，
不同阶段对功能的要求有不同的取舍。 从目前的结果来看， 我的推广策划能力远远
不及我的编程能力， 所以干脆把FMP的全部功能一起推出来了， 也就是3.0。
3.0的东西我还没有在其他地方发过， 我觉得Mitbbs的小圈子挺不错的， 非常适合先
试试水， 希望能听听大家的意见， 高见和低见都欢迎， 只要不歪楼都行。 我在这里
邀请所有的人来参加讨论， 特别是zhaoce和goodbug， 我挺认同你们平时的一些看法
的， 希望你们能对3.0给出一些专业的意见。
FMP针对的是并发和分布编程， 并发主要是在单机内， 分布就是多机了。 FMP的独特
贡献是提供了一个统一的language independent的编程style和element， 轻松地把这
两个重大问题都解决了。 FMP提供的不是具体的系统或实现， FMP提供的是一个独创的
简洁的设计， 使得设计并发和分布系统... 阅读全帖 |
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O**********0
发帖数: 61 | 28 ☆─────────────────────────────────────☆
BHistory (往者的影子) 于 (Fri Sep 9 00:20:11 2011, 美东) 提到:
俺曾认为生命是进化起源的，后来越找越发现进化论像是信仰而非科学结论。可是每有
飞机网友觉着俺如此看待进化论是反科学了。
所以俺本着科学的精神，问个问题，求各位飞机进化论牛人给个科学的答案。
大家知道达尔文进化论是以遗传机制为基础的，第一个有遗传机制的生命怎么来的，当
时根本没有提及。
后人发现这一问题后，就又提出了化学进化论，就是无机分子在某种机制下，自动组合
出了第一个有遗传的生命。此后达尔文进化论似乎可以take care（其实未必，今后再
讨论）。
今天我们先看比第一个有遗传生命的出现简单万亿倍的问题，第一个蛋白质如何化学进化出
现？
先亮亮俺一个愚昧基督徒的愚见：
已知最简单的具有遗传机制的单细胞生命的复杂度已经远远超出人们最初的想象，大概
有400种蛋白质几十万个组成。其中较小的蛋白质大概100个氨基酸，如果在随机热运动
中组成，因为自然界对称的氨基酸不少于40种（20多种氨基酸及... 阅读全帖 |
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a**w
发帖数: 60 | 29 proc sql里可以实现, 但是code 显得太笨:
proc sql;
create table a as
select *,
sum(P1) as sum_P1,
sum(P2) as sum_P2,
sum(P3) as sum_P3,
sum(P4) as sum_P4,
.
.
.
sum(P98) as sum_98,
sum(P99) as sum_99,
sum(P100) as sum_100,
sum(Q) as sum_Q,
calculated sum_P1/calculated sum_Q as F1,
calculated sum_P2/calculated sum_Q as F2,
calculated sum_P3/calculated sum_Q as F3,
calculated sum_P4/calculated sum_Q as F4,
.
.
.
calculated sum_P98/calculated sum_Q as F98,
calculated sum_P99/calculated sum_Q as F99,
calculated... 阅读全帖 |
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S*********g
发帖数: 24893 | 30 【 以下文字转载自 Stock 讨论区 】
发信人: StephenKing (金博士), 信区: Stock
标 题: 向民族英雄包鹏程致敬！为民族英雄包鹏程欢呼！
发信站: BBS 未名空间站 (Wed Jun 3 20:54:21 2015, 美东)
Pengcheng Bao, Graduate Student
Pengcheng is a second year graduate student. He obtained his B.S. in physics
from Nankai Univeristy in China.
Project: Development of methodology for realistic modeling of heterogeneous
catalytic interfaces.
Tel: 310-206-3215
Email: [email protected]
/* */
PENGCHENG BAO
Education
and Awards
2009 –
NANKAI UNIVERSITY TIANJIN, CHINA... 阅读全帖 |
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R*********e
发帖数: 73 | 31 得到博士offer的本科生简历(挂网公开的,应该可以讨论把)在下面,先只请教下打动
发考题们给了博士offer的原因,别的不八卦:)哈哈
照说本科生得让发考题们认为极其有科研的潜质,才能打败无数硕士生,发考题们才
会直接给本科生offer直攻博士;
看这份简历,我的感觉是
1.本科成绩好,会读书
2.参加了很多国内老师的项目,参加了一些海外老师的暑期短期项目,有些学术锻炼和想
法,但无明显成果,可能人缘好,会来事;但不排除夸大自己作用的可能
3.得了一些奖学金,国内高校基本上成绩好加积极参加学校各项活动,对老师会来事,自
然就能得.
3.英语写的好
4.积极参加各种活动,精力充沛,勤奋,把自己的时间,安排的满满当当的,有废寝忘食的
倾向.
5.非常有计划性和目的性,经过几年奋斗,作为本科学生,已经达到面面聚到的无短板程
度.
作为本科生,这份简历无疑是优秀的;但是却无法直接得出极其有科研的潜质的结论;相
反无数硕士生申请攻博士,由于年龄大一些和工作经历,也许本科成绩绩点低一些,得的
奖学金项目少一些,但是有实践经验,多数还会有1-2篇海外(尽管可能级别和影响不高)
期刊发表的... 阅读全帖 |
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S*********g
发帖数: 24893 | 32 Pengcheng Bao, Graduate Student
Pengcheng is a second year graduate student. He obtained his B.S. in physics
from Nankai Univeristy in China.
Project: Development of methodology for realistic modeling of heterogeneous
catalytic interfaces.
Tel: 310-206-3215
Email: [email protected]
/* */
PENGCHENG BAO
Education
and Awards
2009 –
NANKAI UNIVERSITY TIANJIN, CHINA
Bachelor of Science in Physics (Condensed Matter Physics), June 2013.
Academic Record:
2009-2010: Overall: 93.40 Ranking 1/141 Maj... 阅读全帖 |
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w********g
发帖数: 1529 | 33 Definition and Computation of Target Bonus Award
3.1 “Actual EVA” means the EVA as
calculated for each Participating Group for the year in question.
3.2 “Target EVA” for the year in question
means the level of EVA that is expected in order for the Participating Group
to receive the Target Bonus Award. Target EVA for the year in question is
determined as follows:
4
--------------------------------------------------------------------... 阅读全帖 |
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S*********g
发帖数: 24893 | 34 【 以下文字转载自 Stock 讨论区 】
发信人: StephenKing (金博士), 信区: Stock
标 题: 向民族英雄包鹏程致敬！为民族英雄包鹏程欢呼！
发信站: BBS 未名空间站 (Wed Jun 3 20:54:21 2015, 美东)
Pengcheng Bao, Graduate Student
Pengcheng is a second year graduate student. He obtained his B.S. in physics
from Nankai Univeristy in China.
Project: Development of methodology for realistic modeling of heterogeneous
catalytic interfaces.
Tel: 310-206-3215
Email: [email protected]
/* */
PENGCHENG BAO
Education
and Awards
2009 –
NANKAI UNIVERSITY TIANJIN, CHINA... 阅读全帖 |
|
S*********g
发帖数: 24893 | 35 【 以下文字转载自 Stock 讨论区 】
发信人: StephenKing (金博士), 信区: Stock
标 题: 向民族英雄包鹏程致敬！为民族英雄包鹏程欢呼！
发信站: BBS 未名空间站 (Wed Jun 3 20:54:21 2015, 美东)
Pengcheng Bao, Graduate Student
Pengcheng is a second year graduate student. He obtained his B.S. in physics
from Nankai Univeristy in China.
Project: Development of methodology for realistic modeling of heterogeneous
catalytic interfaces.
Tel: 310-206-3215
Email: [email protected]
/* */
PENGCHENG BAO
Education
and Awards
2009 –
NANKAI UNIVERSITY TIANJIN, CHINA... 阅读全帖 |
|
p**********r
发帖数: 1693 | 36 From craigslist:
Epson Stylus CX3810 Color Ink-jet - Printer / copier / scanner
$40 OBO.
This is a three-in-one. It's like your printer, copier, and scanner decided
to have a threesome. You can use it for printing fake North Korean money,
copying illegal underground manifestors, making fliers about your ex and
putting them up in the neighborhood, scanning photos of that barista girl
you're stalking, and homework.
It's color! And not just our visible spectrum of color. It prints in
managinian. Ha... 阅读全帖 |
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s******g
发帖数: 654 | 37 If you cannot handle it by yourself or you want best scenario/analysis
results, contact me every year from November 1 ~ December 15. The review of
your case will be free. The custom tax planning/projection to minimize/
eliminate your AMT will be $400 for 2011. You will get what you pay for.
============================================================================
====
How can I escape the AMT?
One of the best things that can be said about the AMT is that Congress was
successful in making it d... 阅读全帖 |
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c**l
发帖数: 9003 | 38 场地看着不错。。。另外袜子和鞋的颜色的要配
http://www.teamusa.org/USA-Table-Tennis/Ratings/How-Does-the-US
The ‘Matchpoint’ Ratings Processing System
USA Table Tennis player ratings are processed by North American Table Tennis
(NATT) as a contracted service. NATT uses proprietary software called ‘
Matchpoint’ to process the ratings in a manner consistent with the rules
established by USA Table Tennis. Matchpoint is integrated with the USATT
membership system.
Tournaments are processed in chronological order. Late ... 阅读全帖 |
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w*******y
发帖数: 60932 | 39 Appzilla 2:
http://iway.org/9632771
offers 120 iOS apps in one handy package. Usually $0.99, it's currently
free in the App Store.
This app is great to have for that "one off" situation where you wish you
had a particular app, but there's not really a reason to install a dedicated
app.
AppZilla(TM) 2 includes:
? (NEW!) Lyrics Search
? (NEW!) Secret Camera
? (NEW!) Voice Changer FX
? (NEW!) Scrolling LED Banner
? (NEW!) Secret Microphone
? (NEW!) Alien Radio
? (NEW!) Group SMS
? (NEW!) Group E... 阅读全帖 |
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s********n
发帖数: 26222 | 40 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 美国统计局编造通货膨胀数据
发信站: BBS 未名空间站 (Sat Jun 18 00:12:26 2011, 美东)
Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food an... 阅读全帖 |
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s********n
发帖数: 26222 | 41 Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food and energy cost so much?
Posted: March 19, 2008
9:44 pm Eastern
By Jerome R. Corsi
© 2011 WND
Why is it that the federal go... 阅读全帖 |
|
s********n
发帖数: 26222 | 42 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 美国统计局编造通货膨胀数据
发信站: BBS 未名空间站 (Sat Jun 18 00:12:26 2011, 美东)
Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food an... 阅读全帖 |
|
s********n
发帖数: 26222 | 43 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 美国统计局编造通货膨胀数据
发信站: BBS 未名空间站 (Sat Jun 18 00:12:26 2011, 美东)
Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food an... 阅读全帖 |
|
M*****8
发帖数: 17722 | 44 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 美国统计局编造通货膨胀数据
发信站: BBS 未名空间站 (Sat Jun 18 00:12:26 2011, 美东)
Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food an... 阅读全帖 |
|
u*********r
发帖数: 1181 | 45 找到很多人抱怨！
http://sweatingthebigstuff.com/california-tax-calculation-steal
The Problem
After digging through the forms, I realized that California has an insane
way of calculating taxes for part-year residents.
I’m going to use nice, big, round numbers to demonstrate how California
calculates taxes for people in this situation and show that they are really
just stealing money from their constituents. This isn’t reflective of my
actual situation, but shows how this situation affects a lot of people... 阅读全帖 |
|
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u*********r
发帖数: 1181 | 48 如果你们当时没有那么报，那就是你们报错了。
我没说整个收入都报税，而是算那个税率是按照叫如你整个收入都在加州获得，然后那
那个税率，记住是税率 在乘以你在加州的收入。
99%你报什么你退什么，但是不等于你就是对的，绝大部分时间他们都是按照正常的方
式去检查没有怀疑你人会不合理避税。
找到很多人抱怨！
http://sweatingthebigstuff.com/california-tax-calculation-steal
The Problem
After digging through the forms, I realized that California has an insane
way of calculating taxes for part-year residents.
I’m going to use nice, big, round numbers to demonstrate how California
calculates taxes for people in this situation and show that they are really
j... 阅读全帖 |
|
g****g
发帖数: 1828 | 49 In probability theory, the normal (or Gaussian) distribution, is a
continuous probability distribution that is often used as a first
approximation to describe real-valued random variables that tend to cluster
around a single mean value. The graph of the associated probability density
function is “bell”-shaped, and is known as the Gaussian function or bell
curve:[nb 1]
f(x) = \tfrac{1}{\sqrt{2\pi\sigma^2}}\; e^{ -\frac{(x-\mu)^2}{2\sigma^2}
},
where parameter μ is the mean (location of the pe... 阅读全帖 |
|
o*******a
发帖数: 46 | 50 class Reader extends Thread {
Calculator c;
public Reader(Calculator calc){
c = calc;
}
public void run(){
synchronized(c){
try{
System.out.println("Waiting for calculation...");
c.wait();
}
catch(InterruptedException e){
}
System.out.println("Total is :" +c.total);
}
}
public static void main(String[] args){
Calculator calculator = new Calculator();
new Reader(calculator).start();
new Reader(calculator).start();
new Reader(calculator).start();
calcula |
|
