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全部话题 - 话题: irt
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h*****y
发帖数: 157
1
来自主题: BUCT版 - still 乱码!
hehe,ur PC is weird!

~{E ~{#:R;92KD4N#,E ~{Iz!#Wn6`5DDG4NR;N]WSSP~}17~{8vE.Iz~}(~{SPA=UEW@WS8wWxAK~}2~{8vE.Iz~})~{#!~}h
~{Or2;8_!#2;JG?4E.Iz>MJGE?TZW@IOK/>u#,TY2;>M3vH%Br7]11G`1(u
~{11G`1(Uf:C?4#,SHFdJGV\Ne5DV\D)G`Dj0f#,?4MjAK>MSC@45fW@WS#,3ER;8v@q0]WcRS!#51
~{M&OkUR8v~}GF~{5D#,?IJG0`@o5DC{;(6 ~{E.
x*******g
发帖数: 17
2
来自主题: BUCT版 - Re: ~{;XRd;/4s~}(8)
u can say that again!

~{;/4s5DPPU~B%>-9}P^U{RT:s#,2;9\Mb9[;9JGDZTZ#,1H038UHkP#5DJ1:r6<4sSP8D9[!#PPU~
~{@o5D2^Ky~}(~{S&8C=PnBO4JR8|:OJJP)0I~})~{#,JG;/4s<61pWn8_5D2^Ky#,KdH;1HFpCW9z
~{E<8UHkP#DGQ'FZ#,PPU~B%KDB%5D<88v=LJRJGM(O|5D!#:COsJG~}11~{5c0kKxCE#,DcR*JG2;
~{>MV;D\TZ@oCf4tR;MmAK!#E+~}95~{5D~}JJ~{TZDGIO9}<84NWTO0#,;y1>IO6 ~{?*!#MJG4SCE
~{E@3vH%!#DGJ1:rPPU~B%5DNwCESCR;8zLzA4K)W!#,0QLzA45EV1AKIOCf5D7l8U:C?IRTE@3vH%
~{U
w*****g
发帖数: 51
3
来自主题: Security版 - Re: ~{9XSZ~}Linux
~{DcCGNs;aNR5DRbK ~{NRJGK5SPP) ~{SPAKUb8v?ZAnDc2;SC7E5g>M?IRT~}
~{=xHk1pHKIhAK?ZAn5D;zFw~},~{Ub2;JG~}
~{1HE!?*;zOd7E5g ~{6xGR1pHKS@T62;;aV*5@DcTx>-6/~}
~{9}K{5D;zFw~}
~{Cw0WAK0I~}?
~{!>~} ~{TZ~} Forrestxu (~{M|AKNRJGK-~}) ~{5D4sWwVPLa5=~}:
~{!?~}
n*******e
发帖数: 1369
4
Your score – the official result – was obtained by means of IRT (Item
Response Theory)* scoring and the application of various quality control
measures and verification processes. It was calculated as a whole, taking
into account all your responses.
这句话怎么看着像curve呀?
c*******7
发帖数: 2506
5
我们学校的教育测量与评估是在教育学院的教育心理学系,另外心理系还有一个数量心理
学的program.看了网页上列的课程,很多都是两个program的学生都要上的,比如IRT,SEM
,multivariate,psycometrics....哪位来科普一下,比较比较这两个program,比如说就
业方向上。
谢谢。
c*******7
发帖数: 2506
6
准备申请明年秋季入学,选校选的头大。请各位给看看,我的背景:
国内统计本科,美国统计master,GPA3.9,没paper(:,但是RA做过不少IRT的project
,也对这个东东很感兴趣。
请问哪个学校有这方面的PhD program?其实我自己也搜索了不少网上学校主页,不过那
些信息都很官样文章,好像看不出什么道道。如果这里有了解这个方向的XDJM给说说就
更好了。谢谢。
d****6
发帖数: 37
7
来自主题: Education版 - 这有没有columbia tc的
我本科学的统计,但是不想搞theoretical的东西.
大概前2年上些regression, multivariate analysis, survey design, modeling,
psychometric之类的,后几年做些具体的东西,不如IRT, dif, sem.
gre, gmat, tofel之类的考试都是这个专业或者其他运用统计出的题目
taiwan, korea, hk现在发展比较快,国内基本上没有,比如高考,研究考,之类的都没有
比较科学合理的,所以算是新的领域,以后我要回国,所以名校的phd更有用,我和我朋友
讲ucb,um, utaustin他们都不知道,但是columbia都知道.
mailing list好像都是sublease的?
w*********y
发帖数: 7895
8
【 以下文字转载自 Statistics 讨论区 】
发信人: westjourney (胖得走不动), 信区: Statistics
标 题: 想问下Item Response Model的问题
发信站: BBS 未名空间站 (Wed Apr 1 21:18:51 2015, 美东)
我对3PL model的guessing value感的很困惑。是这样的,我用3PL里面得出的guessing
values 来检验不同的mixed 2PL and 3PL model. 比如说,for model 1,items with
guessing values greater than 0.3 was treated as 3PL model. For model 2,
items with guessing values greater than 0.2 was treated as 3PL model. For
model 1, items with guessing values greater than 0.1 was treated as 3PL
model. 我不知道这样做的... 阅读全帖
z*****n
发帖数: 7639
9
I don't know the case in US, but theoretically
a longer wavelength makes the signal propagate farer.
Here is a statistics that shows the activities
in each amateur band (in Ireland).
http://www.irts.ie/cgi/vhf.cgi
a*e
发帖数: 431
10
来自主题: Psychology版 - quantitative research in psych
人格心理学主要是各种 multivariate statistics,
社会心理学主要还是各种假设检验的东西。
前景看来,人格心理学里有一些 experience sampling techniques比较看好,
社会心理学短期应该不会有什么变化,但将来有可能走向 dynamic modeling。
IRT在人格和社会这两个领域里见到得还很少,
就象restless说的一样,最终还是跟研究目的有关。
r******s
发帖数: 2155
11
来自主题: Psychology版 - quantitative research in psych

theory)依据一度是CTT(


psychological
How does IRT apply to attitude measurement and personality trait
assessment? 愿闻其详。


methodology?
m******y
发帖数: 526
12
来自主题: Psychology版 - quantitative research in psych
呵呵,看来真是这么回事,psych major还是更看重CTT.和psych people说起IRT,第一反
应都是“how to get reliability and validity?”...:)

Response
m******y
发帖数: 526
13
来自主题: Psychology版 - quantitative research in psych
我不是做personality trait的,具体怎么操作也不是很清楚。但是应该是IRT model
比CTT能更好的fit data.
有个reference: Reise, S. P., & Waller, N. G.(1990). Fitting the two-parameter
model to personality data: The parameterization of the Multidimensional
Personality Questionnaire. Applied Psychological Measurement, 14, 45-58.





Response
m******y
发帖数: 526
14
来自主题: Psychology版 - quantitative research in psych
这个嘛,对于某些data set,IRT的model确实比CTT好,比如1992年Costa的12 items on
the Neuroticism scale of the Neuroticism Extraversion Openess Five-factor
Inventory data set(N=350).
当然,你可以argue这种data set 不是很多:)

scale



a*e
发帖数: 431
15
来自主题: Psychology版 - thoughts about CTT/IRT
精彩精彩,多谢多谢。
A***A
发帖数: 98
16
来自主题: Psychology版 - thoughts about CTT/IRT
summary
to
that's right on target. :-) well, no wonder it's called Item response theory,
eh?
worked
easier
more
Despite the fact that 1PL and the Rasch model is functionally equivalent,
Rasch arrived at the logistic item characteristic curve from a fundamentally
different perspective, while Birnbaum's logistic models are derived to
approximate the normal ogive model, especially when it's written explicitly
with that D=1.7 constant to make the logistic cdf and the normal cdf as close
as possible.
r******s
发帖数: 2155
17
来自主题: Psychology版 - thoughts about CTT/IRT
^_^
I'd be glad to talk about it. Don't raise your expectation too high though
because I'm more of a informed consumer than a methodologist like you.
Any idea on testing moderating effect in SEM? It's a red hot topic right now
and a much needed one. The common consensus seems still that if you include
interaction term in your equation, use regression instead of SEM.

1
a*e
发帖数: 431
18
来自主题: Psychology版 - Let's vote.
那天看了你的帖子想说来着,你的英语写作非常好,什么时候有时间能不能聊聊一些写作
上的经验?我先感谢你一下,呵呵。
另外,你的关于IRT的那个帖子里有一个reference,作者Chris Fraley碰巧我认识,说一
点关于他的八卦吧,他是UC DAVIS毕业的PHD,现在在还UIC教书,大约快到UIUC去了,他
主要是做attachment,定量方法上似乎也很强,最近还刚出了一本如何利用互联网做研究
的书。他人非常温和,老婆也是UC DAVIS的PHD,是做twin study的。我问他为什么他老
婆对twin study有兴趣,他说老婆自己就是twin,有一个孪生姐姐,她们俩人感情一直都
很好,但很可惜的是,她们好像有一个家族遗传的疾病,早些年她姐姐去世了,给她的打
击挺大的,后来她才开始真正进入twin study的圈子,希望能解答一些学术上的,以及自
己生活经历中的一些困惑吧。

not
A***A
发帖数: 98
19
来自主题: Psychology版 - Short Course on Unfolding IRT Models
nice.
Just to add some background...random thoughts.
Unfolding is a concept developed in Multi-Dimensional Scaling (MDS). In
political scientists' terminology, unfolding refers to what they call
"ideal-point" of attitude, etc.
Major developments of MDS occurred in a period of time from 60s to 70s. Many
of the classical papers of metric and non-metric MDS work were published in
the journal Psychometrika. MDS is one of the many multivariate techniques
that received heavy contribution from psych
y**a
发帖数: 10
20
来自主题: Psychology版 - Quantitative Psychology
Thurstone Scaling (1925) placed scale values for test questions on same scale
as examinees, which share the similar idea with IRT in which proficiency
(theta) for each candidate and probability of correct response on a same
scale. From the perspective, psychometrics is built based on psychology.

manifest
Ledyard
Lord's
most
c******y
发帖数: 114
21
来自主题: Psychology版 - Quantitative Psychology
This is very interesting...
ARIMA, pls introduce more about the IRT development in both psychology field
and education field...
And, what is the difference between psychometrician's job and educational
measurement researcher's job?
thanks.

that
last
l***o
发帖数: 194
22
I want to simulate a data matrix using the 3PL and Generalized partial
credit model.
I am wondering whether anyone knows the distribution of the a, b and c
parameter of the 3PL and their range.
also the distribution of a and b and range of the generalize partial credit
model.
if anyone can give me some help on this, I will really appraciated.
mimi
s**********7
发帖数: 24
23
最近在做一个project,有一个数据,是一群人的考试数据,有 ID, binary
response 0/1, 0 是错误回答,1是正确回答, 以及age, gender, years of
education 这样的variable.
Psychology/measurement 里有IRT model, 所以要求用这一堆数据和Rasch
Model (one parameter logistic Model)来估计item difficulty parameter. 这个比
较简单,用HLM,item 是level1, 人的能力是 level 2.item nested within 每个人,
PROC GLIMMIX 就得出来了。
还有一个要求是用 SAS PROC GLIMMIX,用这个binary response 数据和age
, gender, yearsofeducation variable 来model 人的能力. 我有一点没想通,人的能
力是latent trait,在HLM (Multilevel mixed-m... 阅读全帖
c*******7
发帖数: 2506
24
If you can talk coursework in IRT and classical test theory, you can find
research positions in companies like
American Institutes for Research
ETS
Pearson
ACT
College Board
.....
w*********y
发帖数: 7895
25
来自主题: Statistics版 - 想问下Item Response Model的问题
我对3PL model的guessing value感的很困惑。是这样的,我用3PL里面得出的guessing
values 来检验不同的mixed 2PL and 3PL model. 比如说,for model 1,items with
guessing values greater than 0.3 was treated as 3PL model. For model 2,
items with guessing values greater than 0.2 was treated as 3PL model. For
model 1, items with guessing values greater than 0.1 was treated as 3PL
model. 我不知道这样做的话,最大的问题是什么。。。
我也做了点研究,找到一篇2012年的PAPER(HAN, 2012),是关于fixing c-
parameters. 他/她的观点是说,3PL 里面的guessing values 不reliable,而且和其他
2个parameters (a and b)是相... 阅读全帖
l*********e
发帖数: 5385
26
来自主题: WeddingBells版 - AMERICAN WEDDING (zz)
AMERICAN WEDDING
from: reika
最近看到不少关于婚礼啊,戒指啊的帖子。想起去年初夏的时候我参加了一个很美很精致
的婚礼,所以我来谈谈人家老美的婚俗吧,也许有些是大家已经知道的,有些是没听说过
的. 我总的感觉是我们中国MM都希望自己的另一半能有点人家老美的浪漫情怀。但问题是
中国GG对西方的习俗不敏感呀,所以有机会我们MM要“科普”一下GG。:-)
求婚:一切由GG策划,MM只要等着这给惊喜就好了。然后来个ENGAGEMENT
PARTY,这是SHOW OFF THE RING的最佳时刻。ENGAGEMENT RING如果不是买的,就是GG家
里传下来的。如果订婚戒指不和手指的尺寸,可以拿回店里去RESIZE。当然,特别有心的
GG会想办法弄清楚MM的RING SIZE的。
上面我提到的那个婚礼,男主角是我认识一个老美男生J。J和他MM是学校里认识的,谈了
几年,他觉得认定这个人了,就开始计划求婚。他的正职是编辑,PART-TIME兼职是在一
家餐馆做WAITER,他说兼职的钱主要用来买ENGAGEMENT RING的。01年秋天他和他MM去欧
洲玩,因为他已... 阅读全帖
G***s
发帖数: 10030
27
来自主题: DataSciences版 - DS是不是需要数学基础很强
小弟学心理学(定量方向),基本都在和数据打交道,背景课上过:
比较基础的统计课加上multivariate analysis, non-parametric;
专业课上过一些social science的model:factor analysis, sem, hlm, irt等等;
minor上过的商学院的课database, web programming (.php), system analysis and
design, information system, 商学院讲的特别特别浅,唯一好处就是minor可以写在
cv上。
编程会sas, r, java本科学过2学期,准备重新开始学;
论文计划做优化,属于or的范围,正在学算法。
请问各位前辈。这样的背景,可以准备做ds么?
w*******y
发帖数: 60932
28
Link:Link:
http://www.ammunitiontogo.com/product_reviews.php/pName/50rds-9
I heard about this deal from a good friend I go to the range with. He said
it's a great price especially for federal copper cased.
I know it's a good deal for 147 gr if you happen to be involved with an
agency that mandates it....I know there are a few left. And it's very clean
ammo.
c******a
发帖数: 600
29
日本研制出家务机器人 以解决少子老龄化问题
新闻来源: 日本共同社 于October 25, 2008 08:21:31
10月25日电 东京大学IRT研究机构与丰田汽车公司共同试制了可以替人做家务的
机器人,以此来帮助解决伴随着少子老龄化而来的劳动力不足问题。据日本共同社报道
,24日,机器人向媒体进行了公开展示,它不仅能够打扫房间,还能洗涤衣物。
据称,该机器人的特点是具有较高的物体辨识能力,能区分清扫工具、家具等,还
能自行认识失误并加以修正。
该机器人高155厘米,重约130公斤,由头部、双臂和配有车轮的躯干组成,安装于
躯干内的电脑根据各种程序灵活处理各种动作。当发出指令后,位于头部的5个摄像头
和激光感应器会一边辨识物体的形状和位置,一边完成动作,可连续工作约1小时。
当天,机器人向人们展示了将餐桌上的餐具拿到厨房、以及运用三个手指拈起衬衫
放入洗衣机的动作。该研究机构负责人下山勲表示“将不断改良机器人,目标在7年后
上市销售”。
h*******s
发帖数: 3932
30
来自主题: _TexasHoldem版 - 这手牌我是不是玩错了?
Turn上我感觉kingoptimo是比我强的flush,但觉得应该能beat ghostryyder,鬼使神
差地allin了,心想能把side pot赢下,如果拿到straight flush或者kingoptimo不是
flush的话,就都赢。结果underdog反而赢了。sigh,一手suited connector的raise,
却葬送了所有chip。
Full Tilt Poker Game #9605555806: Table Durham - $0.50/$1 - No Limit Hold'em
- 3:32:07 ET - 2008/12/21
Seat 1: magic33000 ($65.75)
Seat 2: x Fools Gold x ($113.20)
Seat 3: ghostryyder ($148.45)
Seat 4: kingoptimo ($76.35)
Seat 5: maroonpanther ($124.65)
Seat 6: irt ($125)
Seat 7: DrSpitzvogel87 ($25)
Seat 8: IcyCold
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