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polytomous
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polytomous
polytomous, a. (pəˈlɪtəməs) [f. Gr. type *πολύτοµ-ος (f. πολυ- much + -τοµος cut) + -ous.] Divided, or involving division, into many parts. 1. Bot. a. spec. Applied to a leaf having several divisions, but not articulated with the midrib so as to form leaflets (e.g., a pinnatifid or pinnatipartite le...
Oxford English Dictionary
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Polytomous choice
In economics, polytomous choice is a setting (model) with more than two choices; contrast to dichotomous choice. The use of the term polychotomous is also in common usage in the prior research literature; however, polytomous is the more technically correct spelling
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polychotomous
polychotomous, a. (pɒlɪˈkɒtəməs) [Erroneously formed by substituting poly- for di- in dicho-tomous, dichotomous.] Divided, or involving division, into many (or more than two) parts, sections, groups, or branches: = polytomous. So polyˈchotomy, division into more than two parts or groups, as in class...
Oxford English Dictionary
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Polytomous Rasch model
The polytomous Rasch model is generalization of the dichotomous Rasch model. The Polytomous Rasch Model
First, let
be an integer random variable where is the maximum score for item i.
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Polyplacotoma
Their bodily structure consists of elongated polytomous body branches, as well as a maximum size that is greater than 10 mm in length.
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polytomy
polytomy (pəˈlɪtəmɪ) [f. Gr. πολυ-, poly- + -τοµια, f. -τοµος cut. Cf. F. polytomie.] The condition or character of being polytomous. (Distinguished from dichotomy and trichotomy.) 1. Bot. Division into several (more than two) branches at the same point.1875 Bennett & Dyer Sachs' Bot. 148 Dichotomy ...
Oxford English Dictionary
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Uniplacotomia
Their morphology is consistent across the class, resembling the typical Trichoplax as mostly rounded, flat organisms rather than the polytomous, branching
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dichotomous
dichotomous, a. (daɪˈkɒtəməs) [f. L. dichotomos, -mus, a. Gr. διχότοµος cut in half, equally divided: see dicho- and -ous. Cf. F. dichotome (1752 in Hatz.-Darm.).] Divided or dividing into two; characterized by dichotomy. † 1. Astron. = dichotomized 2; of the form of a half-moon. Obs.1690 Leybourn C...
Oxford English Dictionary
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Polychoric correlation
"A two-stage estimation of structural equation models with continuous and polytomous variables".
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不同多级IRT模型 (Polytomous IRT Models) 的区别 - Beneplot
在IRT中,有很多不同的多级模型(Polytomous Models),多级模型指适用于由多种不同计分类别的项目(item)组成的量表或测试的参数计算模型。. 应用广泛的多级模型有:Geoff Masters和Wright(1982)开发的分部评分模型(Partial Credit Rasch Model,PCM),Andersen(1977)和David Andrich(1978)开发的评分量表模型(Rating Scale Model,RSM ...
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Rasch
Rasch (born 1987), Norwegian footballer
Torsten Rasch (born 1965), German musician
See also
Raasch
Rasch Baronets
Rasch model
Rasch model estimation
Polytomous
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分类变量
分类变量如果取多于2个值,成为多值变量(polytomous variables)。
分类变量的例子
血型: A, B, AB 或 O.
一个国家的合法政党
岩石类型: 火成岩, 沉积岩, 变质岩.
表示法
为使统计处理简便,分类变量可以赋以数值索引值,如从1到K,对于K值分类变量。
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David Andrich
He has made substantial contributions to quantitative social science including seminal work on the Polytomous Rasch model for measurement, which is used Some of these publications are listed in articles on the Rasch model and polytomous Rasch model.
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Psychometric software
PARSCALE
PARSCALE is a program designed specifically for polytomous IRT analysis. Ability variables can be polytomous or multivariate normal, and items can be dichotomous or polytomous.
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Single-access key
If the key has several choices it is described as polychotomous or polytomous. (multifurcating) keys is a structural one, and identification key software may or may not support polytomous keys.
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