Digital Module 05: Diagnostic Measurement—The G‐DINA Framework https://ncme.elevate.commpartners.com     

Wenchao Ma  Jimmy de la Torre 《Educational Measurement》2019,38(2):114-115

In this ITEMS module, we introduce the generalized deterministic inputs, noisy “and” gate (G‐DINA) model, which is a general framework for specifying, estimating, and evaluating a wide variety of cognitive diagnosis models. The module contains a nontechnical introduction to diagnostic measurement, an introductory overview of the G‐DINA model, as well as common special cases, and a review of model‐data fit evaluation practices within this framework. We use the flexible GDINA R package, which is available for free within the R environment and provides a user‐friendly graphical interface in addition to the code‐driven layer. The digital module also contains videos of worked examples, solutions to data activity questions, curated resources, a glossary, and quizzes with diagnostic feedback.  相似文献   

The work of the audience: visual matrix methodology in museums     

Lynn Froggett  Lizzie Muller  Jill Bennett 《Cultural Trends》2019,28(2-3):162-176

ABSTRACT

Visual matrix methodology has been designed for researching cultural imaginaries. It is an image-led, group-based method that creates a “third space” research setting to observe audience groups re-enacting lived experience of an event or process that takes place in the third space of a cultural setting. In this article, the method is described through its use in relation to an art-science exhibition, Human+ Future of the species, where three audience groups with investments in technology worked with exhibition material to achieve a complex ambivalent state of mind regarding technological futures. The visual matrix has been designed to capture the affective and aesthetic quality of audience engagement in third space by showing what audiences do with what is presented to them. We argue that such methodologies are useful for museums as they grapple with their role as sites where citizens not only engage in dialogue with one another but actively re-work their imaginaries of the future.  相似文献   

非奇异H-矩阵判定的充分条件     

杨亚芳  梁茂林 《河西学院学报》2011,27(5):1-3

通过比较矩阵元素,得到了一组H-矩阵的充要条件,进一步拓展了H-矩阵的判定准则.  相似文献   

约束条件下的广义最小二乘估计     

朱永娜 《重庆职业技术学院学报》2011,20(4):166-167

本文仿造约束最小二乘估计和广义最小二乘估计的推导方法．给出约束条件下的广义最小二乘估计。  相似文献   

一类特殊矩阵特征值的绝对扰动上界     

孔祥强 《巢湖学院学报》2011,13(3):5-7

利用矩阵的奇异值分解和矩阵的计算技巧研究了Hermite矩阵特征值的扰动界,得到了Hermite矩阵特征值的绝对扰动上界,对以往的结果进行了改进,并推广了Wielandt-Hoffman定理。  相似文献   

石墨炉原子吸收直接法测定海水镍和钒     

黄卓尔  杨秀环  郭越生  张展霞 《中山大学学报论丛》1990,(1)

本文研究了海水基体和共存离子对镍和钒的影响,选用酒石酸、乙酸铵分别作为镍和钒的基体改进剂。未加基体改进剂前,海水镍回收率只有77％,钒的测量精度为11％;加人改进剂后均有改善。采用塞曼效应背景校正技术,热解涂层石墨管,建立了石墨炉原子吸收直接测定海水镍和钒的分析方法。镍和钒的特征质量值(mo)分别为8.4pg和17pg;实际检测限:镍为0.25μgL~(-1)和钒为0.41μgL~(-1)。回收率镍为86～110％,钒为88～106％范围。最大相对标准偏差为谋5.5％,钒4.2％。  相似文献   

复正交矩阵的实正交相抵标准形     

张锦川 《泉州师范学院学报》2001,19(4):1-4

利用矩阵的奇异值分解及基本理论 ,文中给出复正交矩阵的实正交相抵标准形及其全系不变量 .即 :(1)设M =A Bi∈En(C) (复正交阵 ) ,其中A ,B∈Rn×n.则存在Q ,R∈En(R) (实正交阵 ) ,使得QMR =diagσ1σ21- 1i-σ21- 1iσ1(1),… ,σ1σ21- 1i-σ21- 1iσ1(r1);… ;σk σ2 k- 1i-σ2 k- 1iσk (1),… ,σk σ2 k- 1i-σ2 k- 1iσk (rk);In- 2r ,其中σ1>σ2 >… >σk>1,r =r1 r2 … rk.(2 )二复正交矩阵实正交相抵之充要条件是它们的实部有完全相同的奇异值 .  相似文献   

线性方程组相容性定理的新证法     

刘锋 《天津职业院校联合学报》2002,4(1):87-91

线性方程组解的判定在线性代数教学中具有十分重要的作用，但线性方程组相容性定理的传统证明方法需要较多的理论准备，现研究以克莱姆法则和行列式为工具，仅借用矩阵的秩这一概念，给出线性方程组相容性定理一种新的证明方法。  相似文献   

滚动矩阵及其性质     

马海成 《青海师专学报》1997,17(4):32-34

对矩阵引进了滚动运算，然后研究了它的一些有趣性质。  相似文献   

软代数[0,1]上非零矩阵的广义逆     

明平华 《黄冈师范学院学报》2004,24(3):14-16,44

本文在软代数[0，1]上矩阵的schein秩等于其秩的基础上，构造性地证明了[0，1]上任一非零矩阵都存在唯一的广义逆矩阵．  相似文献