Additive Kappa can be Increased by Combining Adjacent Categories
نویسنده
چکیده
Weighted kappa is a measure that is commonly used for quantifying similarity between two ordinal variables with identical categories. Additive kappa is a special case of weighted kappa that allows the researcher to specify distances between adjacent categories. It is shown that additive kappa is a weighted average of the additive kappas of all collapsed tables of a specific size. It follows that, if the reliability of a categorical rating instrument is assessed with additive kappa, the reliability can be increased by combining categories. Mathematics Subject Classification: 62H17, 62H20, 62P15, 62P25
منابع مشابه
Cohen's linearly weighted kappa is a weighted average
An agreement table with n ∈N≥3 ordered categories can be collapsed into n−1 distinct 2×2 tables by combining adjacent categories. Vanbelle and Albert (Stat. Methodol. 6:157–163, 2009c) showed that the components of Cohen’s weighted kappa with linear weights can be obtained from these n−1 collapsed 2× 2 tables. In this paper we consider several consequences of this result. One is that the weight...
متن کاملCombining Ability Study of Biochemical and Physiological Traits of Maize (Zea mays L.) Using fourth Dialllel Griffing’s Method
Biochemical and physiological traits are affected by environmental stresses and therefore the breeding of these traits will play an effective role in stress tolerance. In this study, hybrids of five S7 lines of maize in a 5 × 5 half-diallel design were investigated in order to study the combining ability of biochemical and physiological traits of maize at the Research Farm of Graduate Universit...
متن کاملSymmetric kappa as a function of unweighted kappas
It is shown that a symmetric kappa corresponding to a c × c table with c ≥ 3 categories can be written as a function of the unweighted kappa corresponding to the same table and the c(c − 1)/2 distinct unweighted kappas associated with the (c−1)×(c−1) tables that are obtained by combining two categories. The result is a new MGB-type result.
متن کاملEstimation of Combining Ability and Gene Action for Agro-Morphological Characters of Rapeseed (Brassica Napus L.) Using Line×Tester Mating Design
Combining ability effects were estimated for different agronomic characters in line × tester crossing program comprising 21 hybrids produced by crossing 7 lines and 3 testers. Parents and hybrids differed significantly for general combining ability (GCA) and specific combining ability (SCA) effects, respectively. The variance due to GCA and SCA showed that gene action was predominantly additive...
متن کاملEstimation of Combining Ability and Gene Action for Agro-Morphological Characters of Rapeseed (Brassica Napus L.) Using Line×Tester Mating Design
Combining ability effects were estimated for different agronomic characters in line × tester crossing program comprising 21 hybrids produced by crossing 7 lines and 3 testers. Parents and hybrids differed significantly for general combining ability (GCA) and specific combining ability (SCA) effects, respectively. The variance due to GCA and SCA showed that gene action was predominantly additive...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2015