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Wyszukujesz frazę "discrete-time models" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Badanie dynamiki ubóstwa w Polsce z wykorzystaniem modeli analizy historii zdarzeń o czasie dyskretnym
A STUDY OF POVERTY DYNAMICS IN POLAND USING DISCRETE–TIME EVENT HISTORY ANALYSIS MODELS
Autorzy:
Sączewska-Piotrowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/418307.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
poverty dynamics
event history analysis
discrete-time models
Opis:
Studies on poverty are based predominantly on cross-sectional analysis. Including a time dimension in the analysis allows us to better understanding the dynamics of poverty. In the long run, a unit (individual, household, family) can enter and exit poverty several times. An analysis of determinants of these events allows us to identify groups of households which are particularly likely to enter into poverty, and those with a high chance of exiting poverty. The main aim of this article is to identify determinants of transitions into and out of poverty in Poland in 2000–2011. To achieve this, I use logit regression models for discrete-time event history analysis. I present two specifications of the model, one with number of years spent outside poverty and a second with additional selected socio-economic characteristics of household and household head. The results of estimation suggest that the amount of time spent out of poverty or in poverty does not have a significantly effect, with the exception of one case, on the probability of a change in the status (in poverty/out of poverty). In the case of entries into poverty, including additional variables improves the model. I find that a change in probability of entry into poverty is significantly affected by age and education of household head, place of residence and labour force status of household. However, expanded model of poverty exits is worse than the base model. None of the included variables are statistically significant.
Źródło:
Studia Demograficzne; 2013, 163, 1; 73-96
0039-3134
Pojawia się w:
Studia Demograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of fractional discrete-time consensus models with delays for summator dynamics
Autorzy:
Girejko, E.
Mozyrska, D.
Wyrwas, M.
Powiązania:
https://bibliotekanauki.pl/articles/201408.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional calculus
consensus
single-summator
double-summator
discrete-time models with delays
rachunek ułamkowy
konsensus
model dyskretny
opóźnienia
Opis:
The leader-following consensus problem of fractional-order multi-agent discrete-time systems with delays is considered. In the systems, interactions between agents are defined like in Krause and Cucker-Smale models, but the memory is included by taking both the fractional-order discrete-time operator on the left hand side of the nonlinear systems and the delays. Since in practical problems only bounded number of delays can be considered, we study the fractional order discrete-time models with a finite number of delays. The models of opinions under consideration are investigated for single- and double-summator dynamics of discrete-time by means of analytical methods as well as computer simulations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 403-410
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PRECISE ESTIMATES OF RUIN PROBABILITIES
Autorzy:
Rudź, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/453317.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
discrete time risk models
ruin probabilities
approximations
Solvency II
Opis:
In this paper we investigate a sequence of accurate approximations of ruin probabilities in discrete time models. We prove its convergence to the exact ruin probability without any restrictive assumptions on the claim distribution. Numerical studies show that the sequence, from the first term on, accurately approximates ruin probabilities. A formula for ruin probabilities in the finite horizon is also proposed.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 2; 80-88
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability conditions for fractional-order linear equations with delays
Autorzy:
Mozyrska, D.
Ostalczyk, P.
Wyrwas, M.
Powiązania:
https://bibliotekanauki.pl/articles/201130.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional calculus
discrete-time models with delays
stability
rachunek różniczkowy
model dyskretny
stabilność
Opis:
The problem of stability of the Gr¨unwald-Letnikov-type linear fractional-order discrete-time systems with delays is discussed. For the stability analysis of the considered systems the Z -transform is used. The sufficient conditions for the asymptotic stability of the considered systems are presented. Using conditions related to eigenvalues of the matrices defining the linear difference systems, one can determine the regions of location of eigenvalues of matrices associated to the systems in order to guarantee the asymptotic stability of the considered systems. Some of these regions are illustrated with relevant examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 449-454
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The theorems of Koenig and Birkhoff and their connection with the minimization of the duration time of the measurements of automatic telecommunication channels
Autorzy:
Perz, Szczepan
Zaremba, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/748569.pdf
Data publikacji:
1982
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Channel models (including quantum), Discrete-time control systems, Hypergraphs, Matrix equations and identities, Matrices of integers, Stochastic matrices
Opis:
.
A problem (P) of minimization of the duration time of the measurements of automatic telecommunication channels is considered. P is a discrete optimization problem solved by graph theory methods. It is defined by (i)-(v), where: (i) for each i, 1≤i≤p, and j, 1≤1≤p, there are given k ij channels to be measured between node ”i” and node ”j”; (ii) measurement of one channel lasts one unit; (iii) there are exactly two devices, say A, B, in each node (the case where there is an arbitrary number of devices A, B in each node may be easily reduced to this case); (iv) the channel between node ”i” and node ”j” may be measured only by use of device A being present in node ”i” and device B in node ”j”; (v) in each time both devices A or B may measure only one channel. To solve P, some knowledge of hypergraphs as well as functional analysis (the Krein-Milman theorem) and linear algebra (the Koenig theorem) is necessary. The Koenig theorem is proved in a simple manner similarly as the dual Koenig theorem (which is a new result). As corollaries the Birkhoff theorem about bistochastic matrices and the dual Birkhoff theorem are deduced.
Źródło:
Mathematica Applicanda; 1982, 10, 19
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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