نتایج جستجو برای: ordinal contingency table
تعداد نتایج: 134677 فیلتر نتایج به سال:
Assessing of outcomes and risk factors in the form of qualitative variables is common in the most of medical studies and the research objectives are defined as the relationship between these variables. This paper introduces the concepts and basic and applied statistical tests to examine the relationship between these variables in these studies, including chi-square tests. Principles and...
BACKGROUND Experimental observations classify the protein-folding process as a multi-step event. The backbone conformation has been experimentally recognized as responsible for the early-stage structural forms of a polypeptide. The sequence-to-structure and structure-to-sequence relation is critical for predicting protein structure. A contingency table representing this relation for tetrapeptid...
Asymptotic behavior of the singular value decomposition (SVD) of blown up matrices and normalized blown up contingency tables exposed to Wigner-noise is investigated. It is proved that such an m×n matrix almost surely has a constant number of large singular values (of order √ mn), while the rest of the singular values are of order √ m + n as m,n → ∞. Concentration results of Alon at al. for the...
We present a one-parameter family of models for square contingency tables that interpolates between the classical quasisymmetry model and its Pearsonian analogue. Algebraically, this corresponds to deformations of toric ideals associated with graphs. Our discussion of the statistical issues centers around maximum likelihood estimation.
In medical, biological and social science, three-dimensional contingency tables with ordered categories usually arise and one expects a monotone association, yet one may prefer not to assume a particular parametric model. One of its key roles is how to estimate its parameters under monotonic restrictions. In this paper, we propose an algorithm to compute the maximum likelihood estimation under ...
s or to the complete newspaper corpus. This raises the question of whether better results might have been obtained if the complete data sets had been used. In principle, more data might imply more power. At the same time, more data also entails the risk of more noise. At least for our af data, enlarging the complement leads to worse performance. When we allow any sentence that contains af in ou...
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