c******h
发帖数: 4573 | 1 JPS-A B呢？
我老板好像就不喜欢acs杂志，他老人家这几十年macromolecules屈指可数
还都是和wood和wilkes合作的。。。 |
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x********i
发帖数: 905 | 3 Brendle球定理是和Schoen合作的
他的贡献多少存疑
而且他们的方法是Bohm-Wilking的 |
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D******g
发帖数: 125 | 4 不能这么说吧， bohm-wilking的工作是很重要， 但是brendle和schoen的贡献还是很
大的， 我想应该更大， 要不schoen也不会做1小时报告。
存疑？。。 schoen不是flow的专家， brendle才是， 你觉得呢？。。。
Brendle的lawson猜测的证明可以算天才之作了。 |
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w**o
发帖数: 379 | 8 【 以下文字转载自 Pre_med 俱乐部 】
发信人: wino (wino), 信区: Pre_med
标 题: kaplan电子书一周内免费，赶紧
发信站: BBS 未名空间站 (Tue Jan 4 18:23:40 2011, 美东)
可惜我没有ipad之类的东西, 55555555555555
http://www.freekaplanebooks.com/
ISBN 13 Free Kaplan ebook titles: Author
9781607143994 Cleveland Clinic Guide to Arthritis Clough, John D
9781607143253 Cleveland Clinic Guide to Diabetes Reddy, Sethu
9781609780074 Cleveland Clinic Guide to Epilepsy Wyllie, Elaine
9781607145578 Cleveland Clinic Guide to Fibromyalgia ... 阅读全帖 |
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a******y
发帖数: 9 | 11 这个活动本来是针对斯坦福的国际学生学者和家属的，但是我问过组织者，他们很欢迎
其它有兴趣的朋友来参加。
The sixth Career Hour on Wednesday, February 29 from 5:00 to 6:30 PM at the
Bechtel International Center will focus on Medicine. It will feature Dr.
Thomas J. Fiene, MD and Clinical Professor of Medicine at Stanford. Dr.
Fiene, who retired from a practice in Internal Medicine at the Menlo Clinic
after 52 years, currently mentors young physicians at Stanford.
We invite any international with work experience, volunteer experience, or
an intere... 阅读全帖 |
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t******a
发帖数: 408 | 12 我在
http://www.mitbbs.com/article_t/MedicalCareer/31531335.html
中提到如何搞定病理, 比较Pathoma 和 RRP, 以及使用的策略.
下面是另一部分体会:
2.关于题库 (try to master the principle)
3.考试的一些考点
学习题库
(1). UW qbank – online [教训!!!!!, 只完成了70%, ~ 74% correct -----get
refund for the unused 30% from UW]
(2). USMLERx qbank – online [汗, 只完成了75%,]
1. UW 题库 ----一定要尽早开始做.
如果能重来一次, 我会学习一章/科, 做UW对应一章/科的题目(分科做), 这是第一遍.
待全部学完一遍后, 用timed+mixed 评估学习+检测漏洞.
我的教训是没有早做UW. UW在它的欢迎页上就写得一清二楚 ----- UW目的是为了提高
你的学习水准. 是用来教你学习的题库. 很遗憾我(也许还有其他同学)没有早明白这一
点. U... 阅读全帖 |
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t******a
发帖数: 408 | 13 我在
http://www.mitbbs.com/article_t/MedicalCareer/31531335.html
中提到如何搞定病理, 比较Pathoma 和 RRP, 以及使用的策略.
下面是另一部分体会:
2.关于题库 (try to master the principle)
3.考试的一些考点
学习题库
(1). UW qbank – online [教训!!!!!, 只完成了70%, ~ 74% correct -----get
refund for the unused 30% from UW]
(2). USMLERx qbank – online [汗, 只完成了75%,]
1. UW 题库 ----一定要尽早开始做.
如果能重来一次, 我会学习一章/科, 做UW对应一章/科的题目(分科做), 这是第一遍.
待全部学完一遍后, 用timed+mixed 评估学习+检测漏洞.
我的教训是没有早做UW. UW在它的欢迎页上就写得一清二楚 ----- UW目的是为了提高
你的学习水准. 是用来教你学习的题库. 很遗憾我(也许还有其他同学)没有早明白这一
点. U... 阅读全帖 |
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e**l
发帖数: 62 | 15 “ST4231 Computer Intensive Statistical Methods
Empirical distribution and plug-in principle, general algorithm of bootstrap
method, bootstrap estimates of standard deviation and bias, jackknife
method, bootstrap confidence intervals, the empirical likelihood for the
mean and parameters defined by simple estimating function, Wilks theorem,
and EL confidence intervals, missing data, EM algorithm, Markov Chain Monte
Carlo methods.”
想请了解st的人说一下这门课程对于fiancial engineering的学生有学的必要么 和
fiancial modeling以 |
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a*******1
发帖数: 1554 | 16 我觉得用qq plot和Shapiro-Wilk test比较合适。。。。。。 |
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I***e
发帖数: 1136 | 17 There are many ways to test whether it is Normal. The easiest way is
by drawing a Quantile-Quantile plot against a normal distribution
which should show a straight line if the data does follow normal.
Another way is exactly as you described. It is equal to testing
one of the many implications of a normal distribution. Also, you can
try to use the so called Shapiro-Wilkes test to test normality.
By the way, when the independence test pass, you should ACCEPT
normal assumption, instead of rejecting |
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B****e
发帖数: 441 | 19 John Tukey
From Wikipedia, the free encyclopedia
John Wilder Tukey (June 16, 1915 - July 26, 2000) was a statistician born in
New Bedford, Massachusetts.
Tukey obtained a Bachelor of Science degree in 1936 and a Master of Science
degree in chemistry in 1937 from Brown University before moving to Princeton
University to study for his doctorate in mathematics. During World War II,
Tukey worked at the Fire Control Research Office and collaborated with Samuel
Wilks and William Cochran. After the war |
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p********a
发帖数: 5352 | 20 ☆─────────────────────────────────────☆
activeman (heart) 于 (Tue Dec 26 13:05:29 2006) 提到:
给一个变量，有n个observations，如何检验其normality?请说说统计方法和SAS程序。
如果不知道这些observations是否independent，又应该怎么做？
谢谢
☆─────────────────────────────────────☆
sotough (BigHorse) 于 (Tue Dec 26 15:06:04 2006) 提到:
This is from sas online documents:
Base SAS software provides several tests for normality in the UNIVARIATE
procedure. Depending on your sample size, PROC UNIVARIATE performs the
Kolmogorov-Smirnov, Shapiro-Wilk |
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e**l
发帖数: 62 | 21 “ST4231 Computer Intensive Statistical Methods
Module description: Empirical distribution and plug-in principle, general
algorithm of bootstrap
method, bootstrap estimates of standard deviation and bias, jackknife
method, bootstrap confidence intervals, the empirical likelihood for the
mean and parameters defined by simple estimating function, Wilks theorem,
and EL confidence intervals, missing data, EM algorithm, Markov Chain Monte
Carlo methods.”
想请了解st的人说一下这门课程对于fiancial engineering的学生有学的必要么 |
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e**l
发帖数: 62 | 22 “ST4231 Computer Intensive Statistical Methods
Module description: Empirical distribution and plug-in principle, general
algorithm of bootstrap
method, bootstrap estimates of standard deviation and bias, jackknife
method, bootstrap confidence intervals, the empirical likelihood for the
mean and parameters defined by simple estimating function, Wilks theorem,
and EL confidence intervals, missing data, EM algorithm, Markov Chain Monte
Carlo methods.”
想请了解st的人说一下这门课程对于fiancial engineering的学生有学的必要么 |
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w**********y
发帖数: 1691 | 23 来抢包子...
" analyze those 5 variables all together"
请google: multivariate ANOVA..
简单的说,你这5个response variale如果是independent的,那很好办啦,就一个一个的
做ANOVA就行了(不过你要adjust significant level)..
而MANOVA就是把这5个response当作一个vector,然后去比较你这A,B,C,D的response
vector有没有significant different..而test用的方法基本都是非参的方法..
SAS里面实现MANOVA的例子:
PROC GLM DATA=RAWDATA;
CLASS GROUP;
MODEL Y1 Y2 Y3 Y4 Y5 = GROUP;
manova h=_all_ / printe printh;
然后你的output会有,Wilks' Lambda,Pillai's Trace,Hotelling-Lawley Trace等方法
的test结果..你自己选一个用就行了.
至于要不要用 |
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H******e
发帖数: 333 | 24 就是我现在做一个东西，必须要用paired T-test和one-way repeated measured ANOVA
来做（因为要check一些对应数据的mean是不是相同）。
做之前要check assumptions，但是我有2、3组数据算出来的关于difference的结果，不是normally
distributed。
那个Shapiro-Wilk的p-value是<0.05的。
但是从qq plot来看，observations对应的点还是大致成直线的。
这个该怎么办呀？
谢谢 |
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s*******2
发帖数: 499 | 25 Fattorini, L. (1986). Remarks on the use of the Shapiro-Wilk statistic for
testing multivariate normality. Statistica 46, 209-217.
多谢。 |
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f***a
发帖数: 329 | 26 补充点，对于某些distributions有很多hypothesis testing的方法可以检测数据是不
是符合，譬如最常见的就是normality tests： Shapiro–Wilk test啊，pearson's啊
，等等。你的candidate distribution是些常见的distribution的话，先去google有没
有现成的这些test，不行的话再可以用我上面提到的方法。 |
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x***2
发帖数: 946 | 27 skewness接近0
kurtosis 0.77
峰比正太稍尖
shapiro-wilk显著
log transformation结果更难看
有什么办法吗？ |
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c*******n
发帖数: 300 | 28 univariate 的话，shapiro wilk test 足够好了。 程序采用Royston的近似方法， 结果中包括test statistics 和p value。 |
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p******r
发帖数: 1279 | 29 shikiro wilk? 好像是这样拼。。。 |
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s*******2
发帖数: 499 | 30 Shapiro-Wilk, Anderson Darling, entropy test. |
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l********n
发帖数: 97 | 31 Anderson Darling test
Shapiro–Wilk test
QQ-plot |
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s******h
发帖数: 539 | 32 看你样本量大不大了。大的话就用two sample z-test吧。小的话可以先做一下Shapiro
Wilk Test (univariate) 或者画个QQ plot，差不多过的去的话就two sample t-test
吧。rank test也是可以考虑的，比较robust但是power小了点。也可以考虑一下
bootstrap. |
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w*******d
发帖数: 396 | 33 感谢几位的回复。
这个设计中已经考虑了足够长的washout period，食物B中的VD不会对第二天吃的食物A
中的钙42吸收产生影响。
我遇到的问题是这样的。
N=18 (Two outliers by Shapiro-Wilk W Test were excluded.)
paired t test：p=0.0202
two sample t test：p=0.1763 (equal variance)
Subject 42Ca 44Ca w VD
1 8.16 8.84
2 7.59 7.07
3 1.98 2.34
4 7.93 8.65
5 9.38 8.7
6 4.93 5.54
7 6.21 10.07
8 4.97 5.51
9 3.73 4.1
10 7.52 10.25
11 4.69 9.77
12 5.64 5.18
13 3.43 3.41
14 3.93 4.1
15 5.... 阅读全帖 |
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r*******7
发帖数: 1811 | 34 用proc power还是proc glmprower？
简单说明一下，我simulate了3组data follow multivariate normal，每组有5个obs，
3个variable。做了hypothesis test（SAS 给出的4种test wilk's lambda，lawley
hotelling，pillai，roy's largest root） H0：no group effect。然后重复1000遍
后得到了type I error rate，但如果我想得到power怎么求呢？ |
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y******g
发帖数: 41 | 35 Like in general, I just kind of know how to use them in practice, like:
Durbin-Watson statistic should be > 2 in order for not autocorrelated
Shapiro-Wilks is for testing null hypothesis normality
Do you have to know in theory like why those are the cases?
Thanks |
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l**********8
发帖数: 305 | 36 同事发我的email， 请教大家的见解？
The p-value tests for Normality (kolmogrov-smirnov and shapiro-wilks) are
good indicators of whether data are truly Normal, but the are NOT good
indicators of whether you can use the data in ANOVA or Regression. These
tests will always be significant for large sample sizes, even if the data
are only slightly skewed, and the ANOVA is robust to non-normality for large
sample-sizes from the central limit theorem (even only n=11), meaning your
final conclusions and p-values are ... 阅读全帖 |
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l*****w
发帖数: 344 | 37 We all support you. the story is not bad at all.
I found some similarity with Gone with the Wind
我 ==>Katie Scarlett,
班主任 ==>Ashley Wilkes, "She loved him and wanted him and did not
understand him"
郁兴==>Rhett K. Butler "Rhett is often publicly shunned for his scandalous
behavior and sometimes accepted for his charm |
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l*****w
发帖数: 344 | 38 We all support you. the story is not bad at all.
I found some similarity with Gone with the Wind
我 ==>Katie Scarlett,
班主任 ==>Ashley Wilkes, "She loved him and wanted him and did not
understand him"
郁兴==>Rhett K. Butler "Rhett is often publicly shunned for his scandalous
behavior and sometimes accepted for his charm |
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r******i
发帖数: 270 | 40
/* */（爬升140m，4'02/km）。 |
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g*x
发帖数: 141 | 41 师父好厉害！跑步快的有点儿恐怖……
国内找好下家了？什么时候回国？ |
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d*****n
发帖数: 1875 | 43 不错。 要是玩大铁可以租轮子的。
/* */（爬升140m，4'02/km）。 |
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r******i
发帖数: 270 | 45 实际跑步变化不大，感觉进步最大的是上半年的游泳，骑车倒是一直在提高 |
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h*****7
发帖数: 6781 | 49 EM没有理论论证全局最优的概率，to the best of my knowledge
记住一条，EM这类方法，不属于概率论范畴，属于随机过程，因为它用了指示器（可参
考随机过程计算方法算法导论之类的），所以很难给出理论确界和最优解概率。一般说
无限趋近最优解。
在GMM条件下，倒是有人系统测试过EM的解和最优解有多远
另外MLE本来就没道理的，就是通俗说法的屁股决定脑袋。就算解出全局最优，对参数
估计也是imperfect solution，至于后续Wilk's theorem，也是asymptotic的，所以LZ
就别要求太高了
LZ这种情况，没法用时序或者频域作分析，用EM是比较理想的
靠，说了一堆，回头看发现对LZ没啥帮助，还是疑似我老马甲的YueJia讲得好 |
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p*********e
发帖数: 32207 | 50 from wiki:
http://en.wikipedia.org/wiki/Gas_turbine#Gas_turbines_in_vehicles
Gas turbines in vehicles
Rover JET1Gas turbines are used on ships, locomotives, helicopters, and in
tanks. A number of experiments have been conducted with gas turbine powered
automobiles.
In 1950, designer F.R. Bell and Chief Engineer Maurice Wilks from British
car manufacturers Rover unveiled the first car powered with a gas turbine
engine. The two-seater JET1 had the engine positioned behind the seats,
air intake gri |
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