1,720,960 research outputs found
Beveridge–Nelson filtrų apibendrinimai autonormuotoms sumoms
No full textLet Xt =Σ∞i=0 ψi εt−i be a linear process, where εt , t ∈ Z, are i.i.d. r.v.’s in the domain of attraction of a normal law with zero mean and possibly infinite variance. Generalizing the class of Beveridge–Nelson filters this article proves a central limit theorem for the self-normalized sums U−1n Σnt=1 Xt , where U2n is a sum of squares of block-sums of size m, as m and the number of blocks N = n/m tend to infinity.Darbe įrodoma blokais autonormuota centrinė ribinė teorema. Nagrinėjami tiesiniai procesai su apibendrintu Beveridge–Nelson filtru
Empirinė centrinė ribinė teorema su svoriais silpnai priklausomiems procesams.
No full textThis paper provides a weak convergence theorem for weighted empirical processes of a stationary sequence under a new weak dependence condition introduced by P. Doukhan and S. Louhichi
Invariantiškumo principas nepriklausomiems atsitiktiniams dydžiams su begaline dispersija
No full textA functional central limit theorem for self-normalized adaptive process U−1m,N ζn is considered, where Um,N is a sum of squares of block-sums of size m, as m and the number of blocks N = n/m tend to infinity.Darbe įrodoma funkcinė centrinė ribinė teorema serijų schemai. Nagrinėjamas adaptuotas procesas su auto-normavimu
Invariantiškumo principas nepriklausomiems atsitiktiniams dydžiams su begaline dispersija.
No full textA functional central limit theorem for self-normalized adaptive process [...] is considered, where U_m,N is a sum of squares of block-sums of size m, as m and the number of blocks N=n/m tend to infinity
Hiolderinė FCRT tiesiniams procesams.
No full textLet (X_t)_t>=1 be a linear process defined [...] is a sequence of real numbers and [...] is a sequence of i.i.d. random variables with null expectation and variance 1. This paper provides Hölderian FCLT for (X_t)_t>=1 with wide class of filters. Filters with ψ(i)=l(i)/i for a slowly varying function l(i) are allowed. The weak convergence of polygonal line process build from sums of (X_t)_t>=1 to be standard Brownian motion W in the Hölder space (H_α), 0<α<1/2-1/τ holds provided the proper noise behavior is satisfied: [...]
A central limit theorem for self-normalized sums of a linear process
No full textLet be a linear process, where and [var epsilon]t, t[set membership, variant]Z, are i.i.d. r.v.'s in the domain of attraction of a normal law with zero mean and possibly infinite variance. We prove a central limit theorem for self-normalized sums where is a sum of squares of block-sums of size m, as m and the number of blocks N=n/m tend to infinity.Linear process Normal law Self-normalization
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
