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  Subjects -> STATISTICS (Total: 130 journals)
Showing 1 - 151 of 151 Journals sorted alphabetically
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Argumentation et analyse du discours     Open Access   (Followers: 7)
Asian Journal of Mathematics & Statistics     Open Access   (Followers: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2)
Australian & New Zealand Journal of Statistics     Hybrid Journal   (Followers: 12)
Biometrical Journal     Hybrid Journal   (Followers: 9)
Biometrics     Hybrid Journal   (Followers: 51)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 17)
Building Simulation     Hybrid Journal   (Followers: 2)
CHANCE     Hybrid Journal   (Followers: 5)
Communications in Statistics - Simulation and Computation     Hybrid Journal   (Followers: 9)
Communications in Statistics - Theory and Methods     Hybrid Journal   (Followers: 11)
Computational Statistics     Hybrid Journal   (Followers: 15)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 35)
Current Research in Biostatistics     Open Access   (Followers: 8)
Decisions in Economics and Finance     Hybrid Journal   (Followers: 12)
Demographic Research     Open Access   (Followers: 14)
Engineering With Computers     Hybrid Journal   (Followers: 5)
Environmental and Ecological Statistics     Hybrid Journal   (Followers: 7)
ESAIM: Probability and Statistics     Open Access   (Followers: 4)
Extremes     Hybrid Journal   (Followers: 2)
Fuzzy Optimization and Decision Making     Hybrid Journal   (Followers: 8)
Geneva Papers on Risk and Insurance - Issues and Practice     Hybrid Journal   (Followers: 11)
Handbook of Numerical Analysis     Full-text available via subscription   (Followers: 5)
Handbook of Statistics     Full-text available via subscription   (Followers: 7)
IEA World Energy Statistics and Balances -     Full-text available via subscription   (Followers: 2)
International Journal of Computational Economics and Econometrics     Hybrid Journal   (Followers: 6)
International Journal of Quality, Statistics, and Reliability     Open Access   (Followers: 17)
International Journal of Stochastic Analysis     Open Access   (Followers: 2)
International Statistical Review     Hybrid Journal   (Followers: 12)
Journal of Algebraic Combinatorics     Hybrid Journal   (Followers: 3)
Journal of Applied Statistics     Hybrid Journal   (Followers: 20)
Journal of Biopharmaceutical Statistics     Hybrid Journal   (Followers: 23)
Journal of Business & Economic Statistics     Full-text available via subscription   (Followers: 38, SJR: 3.664, CiteScore: 2)
Journal of Combinatorial Optimization     Hybrid Journal   (Followers: 7)
Journal of Computational & Graphical Statistics     Full-text available via subscription   (Followers: 21)
Journal of Econometrics     Hybrid Journal   (Followers: 82)
Journal of Educational and Behavioral Statistics     Hybrid Journal   (Followers: 7)
Journal of Forecasting     Hybrid Journal   (Followers: 19)
Journal of Global Optimization     Hybrid Journal   (Followers: 6)
Journal of Mathematics and Statistics     Open Access   (Followers: 6)
Journal of Nonparametric Statistics     Hybrid Journal   (Followers: 6)
Journal of Probability and Statistics     Open Access   (Followers: 10)
Journal of Risk and Uncertainty     Hybrid Journal   (Followers: 34)
Journal of Statistical and Econometric Methods     Open Access   (Followers: 3)
Journal of Statistical Physics     Hybrid Journal   (Followers: 13)
Journal of Statistical Planning and Inference     Hybrid Journal   (Followers: 7)
Journal of Statistical Software     Open Access   (Followers: 16, SJR: 13.802, CiteScore: 16)
Journal of the American Statistical Association     Full-text available via subscription   (Followers: 72, SJR: 3.746, CiteScore: 2)
Journal of the Korean Statistical Society     Hybrid Journal  
Journal of the Royal Statistical Society Series C (Applied Statistics)     Hybrid Journal   (Followers: 36)
Journal of the Royal Statistical Society, Series A (Statistics in Society)     Hybrid Journal   (Followers: 28)
Journal of the Royal Statistical Society, Series B (Statistical Methodology)     Hybrid Journal   (Followers: 41)
Journal of Theoretical Probability     Hybrid Journal   (Followers: 3)
Journal of Time Series Analysis     Hybrid Journal   (Followers: 16)
Journal of Urbanism: International Research on Placemaking and Urban Sustainability     Hybrid Journal   (Followers: 23)
Law, Probability and Risk     Hybrid Journal   (Followers: 6)
Lifetime Data Analysis     Hybrid Journal   (Followers: 7)
Mathematical Methods of Statistics     Hybrid Journal   (Followers: 4)
Measurement Interdisciplinary Research and Perspectives     Hybrid Journal   (Followers: 1)
Metrika     Hybrid Journal   (Followers: 4)
Monthly Statistics of International Trade - Statistiques mensuelles du commerce international     Full-text available via subscription   (Followers: 3)
Multivariate Behavioral Research     Hybrid Journal   (Followers: 8)
Optimization Letters     Hybrid Journal   (Followers: 2)
Optimization Methods and Software     Hybrid Journal   (Followers: 6)
Oxford Bulletin of Economics and Statistics     Hybrid Journal   (Followers: 33)
Pharmaceutical Statistics     Hybrid Journal   (Followers: 16)
Queueing Systems     Hybrid Journal   (Followers: 7)
Research Synthesis Methods     Hybrid Journal   (Followers: 7)
Review of Economics and Statistics     Hybrid Journal   (Followers: 138)
Review of Socionetwork Strategies     Hybrid Journal  
Risk Management     Hybrid Journal   (Followers: 17)
Sankhya A     Hybrid Journal   (Followers: 3)
Scandinavian Journal of Statistics     Hybrid Journal   (Followers: 9)
Sequential Analysis: Design Methods and Applications     Hybrid Journal  
Significance     Hybrid Journal   (Followers: 7)
Sociological Methods & Research     Hybrid Journal   (Followers: 40)
SourceOECD Measuring Globalisation Statistics - SourceOCDE Mesurer la mondialisation - Base de donnees statistiques     Full-text available via subscription  
Stata Journal     Full-text available via subscription   (Followers: 8)
Statistica Neerlandica     Hybrid Journal   (Followers: 1)
Statistical Inference for Stochastic Processes     Hybrid Journal   (Followers: 3)
Statistical Methods and Applications     Hybrid Journal   (Followers: 6)
Statistical Methods in Medical Research     Hybrid Journal   (Followers: 27)
Statistical Modelling     Hybrid Journal   (Followers: 18)
Statistical Papers     Hybrid Journal   (Followers: 4)
Statistics & Probability Letters     Hybrid Journal   (Followers: 13)
Statistics and Computing     Hybrid Journal   (Followers: 13)
Statistics and Economics     Open Access  
Statistics in Medicine     Hybrid Journal   (Followers: 122)
Statistics: A Journal of Theoretical and Applied Statistics     Hybrid Journal   (Followers: 12)
Stochastic Models     Hybrid Journal   (Followers: 2)
Stochastics An International Journal of Probability and Stochastic Processes: formerly Stochastics and Stochastics Reports     Hybrid Journal   (Followers: 2)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 10)
Teaching Statistics     Hybrid Journal   (Followers: 8)
Technology Innovations in Statistics Education (TISE)     Open Access   (Followers: 2)
TEST     Hybrid Journal   (Followers: 2)
The American Statistician     Full-text available via subscription   (Followers: 25)
The Canadian Journal of Statistics / La Revue Canadienne de Statistique     Hybrid Journal   (Followers: 10)
Wiley Interdisciplinary Reviews - Computational Statistics     Hybrid Journal   (Followers: 1)

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Journal of Algebraic Combinatorics
Journal Prestige (SJR): 1.199
Citation Impact (citeScore): 1
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-9192 - ISSN (Online) 0925-9899
Published by Springer-Verlag Homepage  [2469 journals]
  • Poincaré polynomial at $$-1$$ - 1 associated with a Young diagram of
           three rows

    • Free pre-print version: Loading...

      Abstract: In this paper, we give an explicit formula for the Poincaré polynomial \(P_\lambda (x)\) for the Betti numbers of the Springer fibers over nilpotent elements in \(gl_n(\mathbb {C})\) of Jordan form \(\lambda =abc\) with \(a\ge b\ge c\ge 0\) at \(x=-1\) . In particular, we introduce \(\lambda \) -vacillating diagrams and show that \(P_{ab}(-1)\) is equal to the number of restricted Dyck paths.
      PubDate: 2022-05-11
       
  • Partitions of the complete hypergraph $$K_6^3$$ K 6 3 and a
           determinant-like function

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      Abstract: In this paper, we introduce a determinant-like map \(\mathrm{det}^{S^3}\) and study some of its properties. For this, we define a graded vector space \(\Lambda ^{S^3}_V\) that has similar properties with the exterior algebra \(\Lambda _V\) and the exterior GSC-operad \(\Lambda ^{S^2}_V\) from Staic. When \(\mathrm{dim}(V_2)=2\) , we show that \(\mathrm{dim}_k(\Lambda ^{S^3}_{V_2}[6])=1\) , which gives the existence and uniqueness of the map \(\mathrm{det}^{S^3}\) . We also give an explicit formula for \(\mathrm{det}^{S^3}\) as a sum over certain 2-partitions of the complete hypergraph \(K_6^3\) .
      PubDate: 2022-05-11
       
  • The facet ideals of matching complexes of line graphs

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      Abstract: Let \(L_n\) be a line graph with n edges and \({{\mathcal {F}}}(L_n)\) be the facet ideal of its matching complex. In this paper, we provide the irreducible decomposition of \({{\mathcal {F}}}(L_n)\) and some exact formulas for the projective dimension and regularity of \({{\mathcal {F}}}(L_n)\) .
      PubDate: 2022-05-11
       
  • The combinatorics of weight systems and characteristic polynomials of
           isolated quasihomogeneous singularities

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      Abstract: A paper of the first author and Zilke proposed seven combinatorial problems around formulas for the characteristic polynomial and the exponents of an isolated quasihomogeneous singularity. The most important of them was a conjecture on the characteristic polynomial. Here, the conjecture is proved, and some of the other problems are solved, too. In the cases where also an old conjecture of Orlik on the integral monodromy holds, this has implications on the automorphism group of the Milnor lattice. The combinatorics used in the proof of the conjecture consists of tuples of orders on sets \(\{0,1,\ldots ,n\}\) with special properties and may be of independent interest.
      PubDate: 2022-05-09
       
  • Random Schreier graphs and expanders

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      Abstract: Let the group G act transitively on the finite set \(\Omega \) , and let \(S \subseteq G\) be closed under taking inverses. The Schreier graph \(Sch(G \circlearrowleft \Omega ,S)\) is the graph with vertex set \(\Omega \) and edge set \(\{ (\omega ,\omega ^s) : \omega \in \Omega , s \in S \}\) . In this paper, we show that random Schreier graphs on \(C \log \Omega \) elements exhibit a (two-sided) spectral gap with high probability, magnifying a well-known theorem of Alon and Roichman for Cayley graphs. On the other hand, depending on the particular action of G on \(\Omega \) , we give a lower bound on the number of elements which are necessary to provide a spectral gap. We use this method to estimate the spectral gap when G is nilpotent.
      PubDate: 2022-05-09
       
  • Absolute points of correlations of $$PG(4,q^n)$$ P G ( 4 , q n )

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      Abstract: Abstract The sets of the absolute points of (possibly degenerate) polarities of a projective space are well known. The sets of the absolute points of (possibly degenerate) correlations, different from polarities, of \(\mathrm {PG}(2,q^n)\) , have been completely determined by B.C. Kestenband in 11 papers from 1990 to 2014, for non-degenerate correlations and by D’haeseleer and Durante (Electron J Combin 27(2):2–32, 2020) for degenerate correlations. The sets of the absolute points of degenerate correlations, different from degenerate polarities, of a projective space \(\mathrm {PG}(3,q^n)\) have been classified in (Donati and Durante in J Algebr Comb 54:109–133, 2021). In this paper, we consider the four dimensional case and completely determine the sets of the absolute points of degenerate correlations, different from degenerate polarities, of a projective space \(\mathrm {PG}(4,q^n).\) As an application, we show that some of these sets are related to the Kantor’s ovoid and to the Tits’ ovoid of \(Q(4,q^n)\) and hence also to the Tits’ ovoid of \(\mathrm {PG}(3,q^n)\) .
      PubDate: 2022-05-03
       
  • Correction To: Breaking up simplicial homology and subadditivity of
           syzygies

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      Abstract: A correction to this paper has been published: 10.1007/s10801-021-01048-4
      PubDate: 2022-05-01
       
  • Classification of bases of twisted affine root supersystems

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      Abstract: Abstract Following the definition of a root basis of an affine root system, we define a base of the root system R of an affine Lie superalgebra to be a linearly independent subset B of the linear span of R such that \(B\subseteq R\) and each root can be written as a linear combination of elements of B with integral coefficients such that either all coefficients are nonnegative or all coefficients are non-positive. Characterization and classification of bases of root systems of affine Lie algebras are known in the literature; in fact, up to \(\pm 1\) -multiple, each base of an affine root system is conjugate with the standard base under the Weyl group action. In the super case, the existence of those self-orthogonal roots which are not orthogonal to at least one other root, makes the situation more complicated. In this work, we give a complete characterization of bases of the root systems of twisted affine Lie superalgerbas with nontrivial odd part. We precisely describe and classify them.
      PubDate: 2022-05-01
       
  • On the second largest eigenvalue of some Cayley graphs of the symmetric
           group

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      Abstract: Abstract Let \(S_n\) and \(A_{n}\) denote the symmetric and alternating group on the set \(\{1,\ldots ,n\},\) respectively. In this paper we are interested in the second largest eigenvalue \(\lambda _{2}(\Gamma )\) of the Cayley graph \(\Gamma =\mathrm{Cay}(G,H)\) over \(G=S_{n}\) or \(A_{n}\) for certain connecting sets H. Let \(1<k\le n\) and denote the set of all k-cycles in \(S_{n}\) by C(n, k). For \(H=C(n,n)\) we prove that \(\lambda _{2}(\Gamma )=(n-2)!\) (when n is even) and \(\lambda _{2}(\Gamma )=2(n-3)!\) (when n is odd). Further, for \(H=C(n,n-1)\) we have \(\lambda _{2}(\Gamma )=3(n-3)(n-5)!\) (when n is even) and \(\lambda _{2}(\Gamma )=2(n-2)(n-5) !\) (when n is odd). The case \(H=C(n,3)\) has been considered in Huang and Huang (J Algebraic Combin 50:99–111, 2019). Let \(1\le r<k<n\) and let \(C(n,k;r) \subseteq C(n,k)\) be set of all k-cycles in \(S_{n}\) which move all the points in the set \(\{1,2,\ldots ,r\}.\) That is to say, \(g=(i_{1},i_{2},\ldots ,i_{k})(i_{k+1})\dots (i_{n})\in C(n,k;r)\) if and only if \(\{1,2,\ldots ,r\}\subset \{i_{1},i_{2},\ldots ,i_{k}\}.\) Our main result concerns \(\lambda _{2}(\Gamma )\) , where \(\Gamma =\mathrm{Cay}(G,H)\) with \(H=C(n,k;r)\) with \(1\le r<k<n\) when \(G=S_{n}\) if k is even and \(G=A_{n}\) if k is odd. Here we observe that $$\begin{aligned} \lambda _{2}(\Gamma )\ge (k-2)! {n-r \atopwithdelims ()k-r} \frac{1}{n-r} \bi...
      PubDate: 2022-05-01
       
  • A numerical characterization of the extremal Betti numbers of t-spread
           strongly stable ideals

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      Abstract: Abstract Let K be a field and let \(S=K[x_1,\ldots ,x_n]\) be a standard polynomial ring over a field K. We characterize the extremal Betti numbers, values as well as positions, of a t-spread strongly stable ideal of S. Our approach is constructive. Indeed, given some positive integers \(a_1,\dots ,a_r\) and some pairs of positive integers \((k_1,\ell _1),\ldots ,(k_r,\ell _r)\) , we are able to determine under which conditions there exists a t-spread strongly stable ideal I of S with \(\beta _{k_i, k_i+\ell _i}(I)=a_i\) , \(i=1, \ldots , r\) , as extremal Betti numbers, and then to construct it.
      PubDate: 2022-05-01
       
  • New constructions of Sidon spaces

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      Abstract: Abstract Sidon spaces can be used to characterize certain multiplicative properties of subspaces. They also have important applications in cyclic subspace codes and Sidon sets. In this paper, we give three new constructions of Sidon spaces. Our results can be applied to cyclic subspace codes. As a result, we obtain some new optimal cyclic subspace codes.
      PubDate: 2022-05-01
       
  • The power graph of a torsion-free group of nilpotency class 2

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      Abstract: Abstract The directed power graph \(\vec {\mathcal {G}}( G)\) of a group G is the simple digraph with vertex set G in which \(x\rightarrow y\) if y is a power of x, and the power graph is the underlying simple graph \(\mathcal {G}( G)\) . In this paper, three versions of the definition of the power graph are discussed, and it is proved that the power graph by any of the three versions of the definition determines the other two up to isomorphism. It is also proved that if G is a torsion-free group of nilpotency class 2 and if H is a group such that \(\mathcal {G}( H)\cong \mathcal {G}( G)\) , then G and H have isomorphic directed power graphs, which was an open problem proposed by Cameron, Guerra and Jurina [9].
      PubDate: 2022-05-01
       
  • Betti numbers of the Springer fibers over nilpotent elements in
           $$gl_n({\mathbb {C}})$$ g l n ( C ) of Jordan form $$(2^b,1^{a-b})$$ ( 2 b
           , 1 a - b )

    • Free pre-print version: Loading...

      Abstract: Abstract In this paper, we compute the generating function for the Betti numbers of the Springer fibers over nilpotent elements in \(gl_n({\mathbb {C}})\) of Jordan form \((2^b,1^{a-b})\) , where \(a\ge b\ge 1\) .
      PubDate: 2022-05-01
       
  • On the size of coset unions

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      Abstract: Abstract Let \(g_1H_1,\ldots ,g_nH_n\) be cosets of subgroups \(H_1,\ldots ,H_n\) of a finite group G such that \(g_1H_1\cup \ldots \cup g_nH_n\ne G\) . We prove that \( g_1H_1\cup \ldots \cup g_nH_n \le \gamma _n G \) where \(\gamma _n<1\) is a constant depending only on n. In special cases, we show that \(\gamma _n=(2^n-1)/2^n\) is the best possible constant with this property and we conjecture that this is generally true.
      PubDate: 2022-05-01
       
  • Superbinomial coefficients

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      Abstract: Abstract We investigate several families of polynomials that are related to certain Euler type summation operators. Being integer valued at integral points, they satisfy combinatorial properties and nearby symmetries, due to triangle recursion relations involving squares of polynomials. Some of these interpolate the Delannoy numbers. The results are motivated by and strongly related to our study of irreducible Lie supermodules, where dimension polynomials in many cases show similar features.
      PubDate: 2022-05-01
       
  • Unlocking the walk matrix of a graph

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      Abstract: Abstract Let G be a graph of order n,  with vertex set \(V=\{v_{1},\dots ,v_{n}\}\) and adjacency matrix A. For a non-empty set S of vertices let \(\mathrm{e}=(x_{1}, \dots , x_{n})^\mathtt{T}\) be the characteristic vector of S,  that is, \(x_{\ell }=1\) if \(v_{\ell }\in S\) and \(x_{\ell }=0\) otherwise. Then the \(n\times n\) matrix $$\begin{aligned} W^{S}:=\big [{\mathrm{e}}, A{\mathrm{e}}, A^{2}{\mathrm{e}},\dots ,A^{n-1}{\mathrm{e}}\big ] \end{aligned}$$ is the walk matrix of G for S. This term refers to the fact that in \(W^{S}\) the \(k{\mathrm{th}}\) entry in the row corresponding to \(v_{\ell }\) is the number of walks of length \(k-1\) from \(v_{\ell }\) to some vertex in S. Let \(\mu _{1},\dots , \mu _{s}\) be the distinct eigenvalues of A. For given S and characteristic vector \(\mathrm{e}\) , we re-arrange these eigenvalues in such a way that 1 $$\begin{aligned} {\mathrm{SD}}(S)\!:\mathrm{e}=\mathrm{e}_{1}+\mathrm{e}_{2}+\dots +\mathrm{e}_{r} \end{aligned}$$ for a certain \(r\le s,\) where the \(\mathrm{e}_{i}\) are eigenvectors of A for eigenvalue \(\mu _{i},\) for all \(1\le i\le r.\) We refer to (1) as the spectral decomposition of S,  or more properly, of its characteristic vector \(\mathrm{e}.\) We show that the walk matrix \(W^{S}\) determines the spectral decomposition of S and vice versa. Explicit algorithms are given which establish this correspondence. In particular, we show that the number r of distinct eigenvectors that appear in (1) is equal to the rank of \(W^{S}.\) Various results can be derived from this theorem. We show that \(W^{S}\) determines the adjacency matrix of G if \(W^{S}\) has rank \(\ge n-1.\) Another application ...
      PubDate: 2022-05-01
       
  • On the depth of binomial edge ideals of graphs

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      Abstract: Abstract Let G be a graph on the vertex set [n] and \(J_G\) the associated binomial edge ideal in the polynomial ring \(S=\mathbb {K}[x_1,\ldots ,x_n,y_1,\ldots ,y_n]\) . In this paper, we investigate the depth of binomial edge ideals. More precisely, we first establish a combinatorial lower bound for the depth of \(S/J_G\) based on some graphical invariants of G. Next, we combinatorially characterize all binomial edge ideals \(J_G\) with \(\mathrm {depth} S/J_G=5\) . To achieve this goal, we associate a new poset \(\mathscr {M}_G\) with the binomial edge ideal of G and then elaborate some topological properties of certain subposets of \(\mathscr {M}_G\) in order to compute some local cohomology modules of \(S/J_G\) .
      PubDate: 2022-05-01
       
  • A classification of flag-transitive block designs

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      Abstract: Abstract In this article, we investigate 2- \((v,k,\lambda )\) designs with \(\gcd (r,\lambda )=1\) admitting flag-transitive automorphism groups G. We prove that if G is an almost simple group, then such a design belongs to one of the eight infinite families of 2-designs or it is one of the eleven well-known examples. We describe all these examples of designs. We, in particular, prove that if \({\mathcal {D}}\) is a symmetric \((v,k,\lambda )\) design with \(\gcd (k,\lambda )=1\) admitting a flag-transitive automorphism group G, then either \(G\leqslant \mathrm {A}\Gamma \mathrm {L}_{1}(q)\) for some odd prime power q, or \({\mathcal {D}}\) is the point-hyperplane design or the unique Hadamard design with parameters (11, 5, 2).
      PubDate: 2022-05-01
       
  • Classification of the non-trivial 2- $$(v,k,\lambda )$$ ( v , k , λ )
           designs, with $$ (r,\lambda )=1$$ ( r , λ ) = 1 and $$\lambda >1$$ λ
           > 1 , admitting a non-solvable flag-transitive automorphism group of
           affine type

    • Free pre-print version: Loading...

      Abstract: Abstract Non-trivial 2- \((v,k,\lambda )\) designs, with \((r,\lambda )=1\) and \(\lambda >1\) , admitting a non-solvable flag-transitive automorphism group of affine type are classified.
      PubDate: 2022-05-01
       
  • Presentations for vertex-transitive graphs

    • Free pre-print version: Loading...

      Abstract: Abstract We generalise the standard constructions of a Cayley graph in terms of a group presentation by allowing some vertices to obey different relators than others. The resulting notion of presentation allows us to represent every vertex-transitive graph.
      PubDate: 2022-05-01
       
 
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