Results 71 to 80 of about 2,801,507 (197)

Confidence intervals for the between-study variance in random-effects meta-analysis using generalised heterogeneity statistics: should we use unequal tails?

BMC Medical Research Methodology, 2016
Background Confidence intervals for the between study variance are useful in random-effects meta-analyses because they quantify the uncertainty in the corresponding point estimates.
Dan Jackson, Jack Bowden
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Asset Pricing Under The Quadratic Class [PDF]

We identify and characterize a class of term structure models where bond yields are quadratic functions of the state vector. We label this class the quadratic class and aim to lay a solid theoretical foundation for its future empirical application.
Markus Leippold, Liuren Wu
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Reformulating mixed-integer quadratically constrained quadratic programs [PDF]

, 2011
It is well known that semidefinite programming (SDP) can be used to derive useful relaxations for a variety of optimisation problems. Moreover, in the particular case of mixed-integer quadratic programs, SDP has been used to reformulate problems, rather ...
Galli, L, Letchford, A. N.
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Systems of quadratic forms.

Journal für die reine und angewandte Mathematik (Crelles Journal), 1984
Let \(u_ F(r)\) be the smallest integer such that every system of r quadratic forms in n variables, defined over a field F, has a nontrivial common zero if \(n>u_ F(r)\). Let \(u_ F(r)=\infty\) if no such integer exists. Then \(u_ F(r)\leq frac{1}{2}(r^ 2+r)u_ F(1)\) and there exist fields for which this bound is best possible when \(r=1,2,3\). If F is
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Embeddability of quadratic forms in Pfister forms

Indagationes Mathematicae, 2000
Let \(F\) be a field of characteristic not 2. An anisotropic quadratic form \(q\) over \(F\) is called \(m\)-embeddable if \(q\) is similar to a subform of an anisotropic \(m\)-fold Pfister form. Let \(m(q), m_{\text{ext}}(q)\), \(m_{ptr}(q)\) be the smallest integer \(m\) such that \(q\) is \(m\)-embeddable over \(F\), over an extension of \(F\), over
Izhboldin, O., Hoffmann, D.
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ON SOME PROPERTIES OF UNBOUNDED BILINEAR FORMS ASSOCIATED WITH SKEW-SYMMETRIC L2(Ω)-MATRICES

Vìsnik Dnìpropetrovsʹkogo Unìversitetu: Serìâ Modelûvannâ, 2013
We study the bilinear forms on the space of measurable square-integrable functionswhich are generated by skew-symmetric matrices with unbounded coecients.We show that in the case when a skew-symmetric matrix contains L2-elements, the corresponding ...
P. I. Kogut
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Round Quadratic Forms

Journal of Algebra, 1995
The author has been motivated by the wish to formulate the results of \textit{B. Alpers} [J. Algebra 137, 44-55 (1991; Zbl 0727.11017)]\ on round quadratic forms for quadratic forms instead of for elements of the Witt ring. The goal of this paper is finding a classification of round quadratic forms.
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소수와 서로소인 제곱의 합으로 표현되는 이변수 이차형식

, 2019
학위논문 (박사)-- 서울대학교 대학원 : 자연과학대학 수리과학부, 2019. 2. 오병권.제곱의 합으로 표현되는 임의의 n변수 양의 정부호 이차형식이 소수 p로 나누어지지 않는 s개 이하의 제곱의 합으로 표현될 때, 이러한 성질을 만족하 는 s의 값 가운데 가장 작은 정수를 s_p(n)이라 정의한다. 이 논문에서 우리는 s_2(2) = 11, s_3(2) = 7, s_5(2) = 6, 그리고 임의의 홀수인 소수 p에 대하여, 5 ≤ s_p(2) ≤
임누리
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Invariants de Witt des involutions de bas degré en caractéristique 2

Comptes Rendus. Mathématique
A $3$-fold and a $5$-fold quadratic Pfister forms are canonically associated to every symplectic involution on a central simple algebra of degree $8$ over a field of characteristic $2$.
Tignol, Jean-Pierre
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The Theoretical Regularity Properties of the Normalized Quadratic Consumer Demand Model [PDF]

We conduct a Monte Carlo study of the global regularity properties of the Normalized Quadratic model. We particularly investigate monotonicity violations, as well as the performance of methods of locally and globally imposing curvature.
William Barnett, Ikuyasu Usui
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