6,388 research outputs found
Sequential importance sampling for multiway tables
We describe an algorithm for the sequential sampling of entries in multiway
contingency tables with given constraints. The algorithm can be used for
computations in exact conditional inference. To justify the algorithm, a theory
relates sampling values at each step to properties of the associated toric
ideal using computational commutative algebra. In particular, the property of
interval cell counts at each step is related to exponents on lead
indeterminates of a lexicographic Gr\"{o}bner basis. Also, the approximation of
integer programming by linear programming for sampling is related to initial
terms of a toric ideal. We apply the algorithm to examples of contingency
tables which appear in the social and medical sciences. The numerical results
demonstrate that the theory is applicable and that the algorithm performs well.Comment: Published at http://dx.doi.org/10.1214/009053605000000822 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Computing HF^ by factoring mapping classes
Bordered Heegaard Floer homology is an invariant for three-manifolds with
boundary. In particular, this invariant associates to a handle decomposition of
a surface F a differential graded algebra, and to an arc slide between two
handle decompositions, a bimodule over the two algebras. In this paper, we
describe these bimodules for arc slides explicitly, and then use them to give a
combinatorial description of HF^ of a closed three-manifold, as well as the
bordered Floer homology of any 3-manifold with boundary.Comment: 106 pages, 46 figure
Extending du Bois-Reymond's Infinitesimal and Infinitary Calculus Theory
The discovery of the infinite integer leads to a partition between finite and
infinite numbers. Construction of an infinitesimal and infinitary number
system, the Gossamer numbers. Du Bois-Reymond's much-greater-than relations and
little-o/big-O defined with the Gossamer number system, and the relations
algebra is explored. A comparison of function algebra is developed. A transfer
principle more general than Non-Standard-Analysis is developed, hence a
two-tier system of calculus is described. Non-reversible arithmetic is proved,
and found to be the key to this calculus and other theory. Finally sequences
are partitioned between finite and infinite intervals.Comment: Resubmission of 6 other submissions. 99 page
Energy translation and Proper-Time Eigenstates
The usual quantum mechanics describes the mass eigenstates. To describe the
proper-time eigenstates, a duality theory of the usual quantum mechanics was
developed. The time interval is treated as an operator on an equal footing with
the space interval, and the quantization of the space-time intervals between
events is obtained. As a result, one can show that there exists a zero-point
time interval.Comment: 15 pages, No figur
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