m******y
发帖数: 526 | 1 【 以下文字转载自 Psychology 讨论区,原文如下 】
发信人: meainpsy (BouncingBeta), 信区: Psychology
标 题: Re: thoughts about CTT/IRT
发信站: Unknown Space - 未名空间 (Fri Apr 9 14:52:02 2004) WWW-POST
Nice piece ah, I like this a lot.
Just add some comments:
1) The difference between CTT and IRT also can be detected from their basic
models/functions: since under CTT, X=T+E. What CTT takes care of is a summary
of observable scores. That is to say, CTT deals with the test as a packet of
items. While under IRT or also the fact |
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m******y
发帖数: 526 | 2 Nice piece ah, I like this a lot.
Just add some comments:
1) The difference between CTT and IRT also can be detected from their basic
models/functions: since under CTT, X=T+E. What CTT takes care of is a summary
of observable scores. That is to say, CTT deals with the test as a packet of
items. While under IRT or also the factor analysis, X=lamda*F +U, where F is
the latent trait, so X here refers to one specific/individual item. That is to
say, IRT deals with the test item by item.So we don't h |
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r*****w
发帖数: 44 | 3 我这次定的从北京返回美国的机票是加行 PEK-YVR,中午12点到。UA，YVR到IAH，晚11
点起飞。仔细看了smallfox的帖子，自己也查了一些资料，但是还是有一点很confuse。
查了一下官方的规定，
http://cbsa-asfc.gc.ca/travel-voyage/twov-tsv/cct-pptc-eng.html
Passengers travelling to the United States
In addition to the conditions above, while travelling to the U.S., eligible
CTT nationals must hold a confirmed onward ticket for a direct flight to the
U.S. leaving Canada the same travel day (no layover or overnight stay is
permitted).
（这里面的same travel day是什么意思？不过夜里12点就可以？）
Notice: T... 阅读全帖 |
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r******s
发帖数: 2155 | 4 真的专家发话了。very informative.
不过你的例子都是测验方面的。测验和心理测量的区别是前者有正确答案而后者没有。
比较一下智力测验和likert-type scale.例如多项选择，对智力测验来说，如果A是正确
答案，那么其他的就都是错的。于是就可以用IRT考察每个选项的区分度。但是心里测验
在指导语里就明确指出答案没有正确与错误之分，要按照自己的真实感受来填写。所以，
我很外向和我很不外向都可能是正确答案，因为每个人的大案都可能是不同的。
你对alpha的攻击个人认为略有偏颇。方法毕竟只是方法，其功效由目的所左右。
测验的目的是区分高能力者和低能力者，所以每个题目以及选项的区分都很重要。
但心里测量的目标是精确测量，所以题目之间的consistency是必要的。在没有更好
的假设之前，没有理由区别对待每个题目。
所以回到我以前提过的，因为目的不同，所以CTT和IRT的功用不同。不存在一个比
另一个更优越的问题。在测验领域，我同意IRT比CTT更有效，但在信里测量方面，
IRT是不合适的。
(in
that
a
least
starts
a
trait
Instead |
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r******s
发帖数: 2155 | 5 Great job. I can tell that you are pretty knowledgable about IRT with a
passion. Good for you.
I'll check that article out for sure when I have a chance. In the mean time,
I think there is a lot of IRT 启蒙 needed in this board. You mentioned a
bunch of terms that I have no clue.
I'm quite familar with CTT,but I'm also an open-minded researcher. Your
advertisement does sound appealing and coherent. But that still leaves me the
doubt that if IRT is superior to CTT in all acounts, why it's not domin |
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c******2
发帖数: 923 | 6 小狐狸，我又帮人买了几张ac的票，是不是一定得联系ac做twov备注？我对ac客服水平
表示怀疑了，万一他嘴上说ok做好了，其实不懂ctt政策没有给我做任何事情，到时过
境会不会有麻烦？
他们又是瞎扯的看看iata的条款，哪里写着飞离加拿大的航班规定是什么公司的？ac的
客服接电话的信口开河胡说八道已经是非常普遍的情况了，你不是第一个被忽悠的，也
不会是最后一个
★ Sent from iPhone App: iReader Mitbbs 7.56 - iPad Lite |
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a*e
发帖数: 431 | 7 【 以下文字转载自 Psychology 讨论区 】
【 原文由 ARIMA 所发表 】
Educational measurement is quite different from psychological measurement (in
a strict sense) both in theory and in pratice. The state testing program that
I've worked on has a routine sample size of 30,000 for each form of the test
in each administration. And think about the SAT or tests made at ETS, while a
typical social psychological experiment in JPSP has a sample size that's
roughly 1% of a typical state testing program.
CTT and IRT are compli |
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A***A
发帖数: 98 | 8 Educational measurement is quite different from psychological measurement (in
a strict sense) both in theory and in pratice. The state testing program that
I've worked on has a routine sample size of 30,000 for each form of the test
in each administration. And think about the SAT or tests made at ETS, while a
typical social psychological experiment in JPSP has a sample size that's
roughly 1% of a typical state testing program.
CTT and IRT are complimentary to each other. For practical stuatio |
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r******s
发帖数: 2155 | 9 Great! Another expert. I like your point 1 in particular because I'm into
Covariance Structure Modeling a lot.
Can you explain more about the difference between factor analysis and IRT?
summary
to
worked
easier
more
it
tests.
CTT.
test
while
be
IRT |
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J****S
发帖数: 15 | 10 Pls contact: d******[email protected] for more information
Requirements:
1、BS in Clinical Medicine/Basic Medicine from top universities
2、Overseas Ph.D in lifescience(no clincal experiences need) / or have
clinical trial management experiences(no further degree needed)
Responsibilities:
1、Work as a CTL on Medium to High complexity studies including multi-
country / multi-centre trials and lead the Clinical Trial Team (CTT) in
development of the protocol and related documents.
*CTL will involve the... 阅读全帖 |
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l*****d
发帖数: 7963 | 11 全新的史蒂芬霍金中心(Stephen Hawking Centre)正式开幕，该中心隶属于加拿大安大
略省的Perimeter理论物理研究所(Perimeter Institute for Theoretical Physics)。
这一尖端开拓项目将通过向物理学家们提供最理想的研究环境，对从次原子到整个宇宙
各个层面的物理现象本质进行接触、设想、再现和领悟，从而帮助推进科研进展。
加拿大安大略省鼓励思想火花的碰撞和伟大的研究发明。因此不少全球领先的思想家、
革新者和企业家选择在这里运作其独一无二的设施和机构，Perimeter理论物理研究所
的史蒂芬霍金中心正是其中之一。
安大略省既是先进研究和创新领域的全球中心，同时也是那些专注于在物理、信息科技
、生命科学、先进材料和纳米科技等高精尖领域里开拓进取型产业的热选地点。
扩张后的研究所将能够容纳多达250名物理学家和科研培训生，从而使得安大略省的
Perimeter理论物理研究所成为世界范围内同类研究所中最大规模的，并集理论物理研
究、培训和其他延伸体系为一体。该中心将提供自发进行跨学科研究活动的互动区域以
及举行研讨会、工作会的报告... 阅读全帖 |
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c********t
发帖数: 259 | 12 个人觉得，由于IRT model在巨大样本（3PL似乎要求1000以上吧）下才能得到比较精确的
估计，而很多心理学试验都没法达到这样的要求，所以在心理学里面ctt还是占统治地位
。但是在教育测验中，尤其是涉及到州一级的测验或全国性的测验被试动则都是上万，IR
T已经逐渐取代ctt，样本稍小的也可以用Rasch model. 环顾教育学院的measurement专业
除了一些老牌的学校因为大牛们都是CTT过来的还抱着CTT和Generalizibility theory之
外，很多学校都是主要讲IRT了。心理学系不太清楚，我现在干活的儿童心理学的项目，
基本用的还是ctt，研究方法上对SEM和HLM比较看重。
on
model
代
发
以 |
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p***e
发帖数: 29053 | 13 Easier transit via Canada for travel to the U.S.
March 28, 2011
Air Canada is an approved air carrier participating in the Canadian
government's Transit without Visa (TWOV) program, and China Transit Trial (
CTT). This participation allows Air Canada's customers who are citizens of
certain Asian countries and who are transiting through either Vancouver
Airport or Toronto-Pearson Airport to travel to or from the U.S. without
obtaining a Canadian temporary resident visa under the conditions outlin... 阅读全帖 |
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J****S
发帖数: 15 | 14 Pls contact: d******[email protected] for more information
Requirements:
1、BS in Clinical Medicine/Basic Medicine from top universities
2、Overseas Ph.D in lifescience(no clincal experiences need) / or have
clinical trial management experiences(no further degree needed)
Responsibilities:
1、Work as a CTL on Medium to High complexity studies including multi-
country / multi-centre trials and lead the Clinical Trial Team (CTT) in
development of the protocol and related documents.
*CTL will involve the ... 阅读全帖 |
|
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l********1
发帖数: 13 | 16 下面这个网页上，我觉得我自己其他条件都符合，就是关于我的美国签证糊涂了。我的
f1签证11月过期，我12月回国。同一个网页上有不同的说法，请问我还需要transit
visa么？在多伦多现场办可以么？
www.cbsa-asfc.gc.ca/publications/pub/bsf5023-eng.html#s2x8
According to the regulations in the above webpage:
1. The CTT permits Chinese nationals holding a valid U.S. visa to transit a
participating Canadian international airport on their way to or form the U.S
. without a Canadian temporary resident visa if they meet the following
requirements:
they hold a valid U.S.... 阅读全帖 |
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t******n
发帖数: 6242 | 17 注意时态：
"hold"
"entered"
下面这个网页上，我觉得我自己其他条件都符合，就是关于我的美国签证糊涂了。我的
f1签证11月过期，我12月回国。同一个网页上有不同的说法，请问我还需要transit
visa么？在多伦多现场办可以么？
www.cbsa-asfc.gc.ca/publications/pub/bsf5023-eng.html#s2x8
According to the regulations in the above webpage:
1. The CTT permits Chinese nationals holding a valid U.S. visa to transit a
participating Canadian international airport on their way to or form the U.S
. without a Canadian temporary resident visa if they meet the following
requirements:
... 阅读全帖 |
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m******y
发帖数: 526 | 18
怎么算呢？是把所有的item都扔进去，还是先做factor
我觉得要看你是要怎么分析了。Cronbach's
alpha是在CTT下面的吧，应该是假设所有的item都是measure一个factor的了/或者说CTT
不考虑多个factor的问题，所以我觉得不用作factor analysis?
一共只有2个components
那
你还可以改进这个item，呵呵 |
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y***i
发帖数: 11639 | 19 http://www.ctt.cn/elms/portal/detail.jsp?docID=9228&type=72&parentType=7
中国烟草培训网
中国烟草未来蓝图初现。
到2015年，中国有望出现年销售收入上千亿元的烟草品牌，“中华”、“红塔山”
和“芙蓉王”面临角逐。届时，以上海烟草集团、红塔集团和湖南中烟为代表的沪系、
滇系和湘系，或成三足鼎立之势，主导中国烟草格局。
这是今年初，全国烟草工作会议确定的“十二五”规划中的品牌目标之一。
品牌做大需要资源。而资源的整合需要烟草业通过兼并重组来得以实现。“卷烟品
牌跨省整合难度加大，重点骨干品牌扩张制约因素增多，体制性障碍有待于进一步克服
。”国家烟草专卖局局长姜成康指出。
因此，谁能率先成为闯千亿销售大关的中国烟草品牌，面临现实拷问。
谁是最大？
国家烟草专卖局打造“10多个重点骨干品牌”终于有望揭开谜底。
2009年，中国烟草再度丰收。全行业实现税利5131亿元，同比增长559亿元。而在
金融危机袭击下，西方烟草俱损。《财富》公布了2009年度全球企业五百强名单 |
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n***l
发帖数: 932 | 21 对，两年半就开了5w6。车主换了个11年的CTT。
再试试 |
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e******g
发帖数: 5344 | 22 上一代ctt太难看了。不如加两万买辆12年的卡宴turbo |
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h*e
发帖数: 10233 | 23 上一代ctt太难看了。不如加4万买辆新的卡宴turbo |
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e******g
发帖数: 5344 | 24 上一代ctt太难看了。不如加两万买辆12年的卡宴turbo |
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h*e
发帖数: 10233 | 25 上一代ctt太难看了。不如加4万买辆新的卡宴turbo |
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a*****n
发帖数: 5158 | 32 到cbp deferred sites去改
http://www.cbp.
gov/linkhandler/cgov/toolbox/contacts/deferred_inspection/deferred_inspe
ction_sites.ctt/deferred_inspection_sites.pdf
diy |
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t*h
发帖数: 1629 | 36 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: tch (TCH), 信区: SanFrancisco
标 题: 护照有效期和I94的日期
发信站: BBS 未名空间站 (Tue Aug 3 02:28:45 2010, 美东)
今天才发现CBP给我的I94得日期是pp expiration date - 6 month
我的护照2011 feb过期，现在我的I94是2010 aug过期。
那是不是意味着如果要在美国代六个月，比如探亲，至少要有一年的有效期？
从这个cbp得doc来说，好像是那样的。有人有经验么？
http://www.cbp.gov/linkhandler/cgov/travel/inspections_carriers_facilities
/clp/bulletins/clp_bullentin_04162008.ctt/clp_bulletin_04162008.pdf
谢谢。 |
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m*****i
发帖数: 4342 | 43 CONG!
Should get rid of my LCC at $8:).
Luckly, all my other holding are doing O.K.
I was so afraid to sell stocks now. I sold my holding of CTT last week for 2
.20/share, today, it went up over $3 at one time. |
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m*****i
发帖数: 4342 | 44 I basically buy and hold for this year.
Major loser:PEIX, NIV(lost more then 40K).
Biggest winner: RAS, CTT almost tripled
Double: HOV, MBI
doing O.K.CNXT, LCC, UEC
Major mistrade, RDN/PMI, at one time, had lots of profit, end up only make
small profit(too greedy!).
Overall, very good year. |
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w********2
发帖数: 16371 | 45 AAON,ACSF,AEIS,AHL,AIG,AJX,ALDW,ALJ,ALL,AMC,AMCC,APTS,ARE,AVD,AXON,BCRH,BGSF
,BRSS,CAR,CBT,CDE,CFMS,CGNX,CHGG,CHSP,CTT,CUTR,CYH,DNB,DRRX,DWRE,ELNK,ENH,
ENS,FDNH,FIT,FN,GGP,GPP,GPRE,IMPR,ININ,IVAC,KONA,LMNX,LMOS,MCEP,MDAS,MDU,MIC
,MRLN,NGHC,NLS,NPTN,NSH,NSTG,OHI,OLN,ONDK,OTTR,PKY,PLOW,PPS,PQ,PRAH,PXD,QLYS
,QTNT,RAIL,RNG,RSE,RSPP,RTEC,RYN,SANM,SGY,SNHY,SSNC,SSW,SYKE,TDOC,THC,TNET,
TTOO,TXRH,UIL,UNXL,VIAV,VNO,WEYS,WSTC, |
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发帖数: 1 | 50 anybody interested in this position can contact me through private messaging
. We're also open to junior to intermediate level people. Citizen and GC
preferred. This job is located in Atlanta, GA.
https://www.glassdoor.com/job-listing/it-senior-automation-engineer-pos-
functionality-napa-auto-parts-JV_IC1155583_KO0,47_KE48,63.htm?jl=2850194134&
ctt=1533157636973 |
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