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Tytuł:
The hazard function and its role in a non-parametric duration analysis of enterprises in the Łódzkie Voivodeship
Autorzy:
Mikulec, Artur
Powiązania:
https://bibliotekanauki.pl/articles/424857.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
enterprises
duration analysis
hazard function
cumulative hazard function
mean absolute percentage error
Opis:
In a duration analysis of enterprises, as a rule there are determined four basic functions related to the time of their duration, i.e.: the density function; the distribution function; the survival function, and the hazard function. It turns out that the hazard function and its cumulative version are the key to understanding modern survival analysis. The aim of the paper is to indicate the best method of the estimation of the values of individual functions in survival analysis based on other functions. The paper provides compiled and classified information on particular functions used in the non-parametric duration analysis of enterprises. It examines some theoretical and practical problems related to the determination of, among others, the hazard function and the cumulative hazard function on the basis of data in cohort tables and the results of the estimation of the survival function with the use of the Kaplan- Meier method. The considerations included in the paper are illustrated with the results of analyses for enterprises established in the Łódzkie Voivodeship in 2001-2015 (including those which went into liquidation).
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2019, 23, 3; 59-75
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring and Explaining Income Inequalities in Poland: an Estimation of Lorenz Curves using Hazard Function Approach
Autorzy:
Landmesser, J.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1029578.pdf
Data publikacji:
2018-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
income inequalities
hazard function
Lorenz curve
Opis:
In this study we compare the income distributions for men and women in Poland in 2014. To examine the differences in the entire range of income values we utilize the hazard function approach. A flexible hazard-function based estimator in the presence of covariates (education, age, etc.) is used to construct conditional density and cumulative distribution functions. Then, we decompose the differences between two distributions using the counterfactual distribution. We estimate also the Lorenz curves for incomes and decompose the differences between the values of the Gini coefficients.
Źródło:
Acta Physica Polonica A; 2018, 133, 6; 1445-1449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk estimation of SAR action
Autorzy:
Burciu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/320544.pdf
Data publikacji:
2008
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
ryzyko
funkcja ryzyka
SAR
risk
hazard function
Opis:
The paper presents the influence of shipborne incidents on possible consequences. Non rescue ship during SAR action can come under risk. The presented hazard function in dependence on the vessel type, involved in SAR action, possible consequences for ships during the SAR action allow proposing the risk measure and matrix of vessel suitability during SAR action.
Źródło:
Annual of Navigation; 2008, 13; 25-34
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Smoothed estimator of the periodic hazard function
Autorzy:
Dudek, A.
Powiązania:
https://bibliotekanauki.pl/articles/255261.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
bootstrap
consistency
multiplicative intensity model
periodic hazard function
Opis:
A smoothed estimator of the periodic hazard function is considered and its asymptotic probability distribution and bootstrap simultaneous confidence intervals are derived. Moreover, consistency of the bootstrap method is proved and some applications of the developed theory are presented. The bootstrap method is based on the phase-consistent resampling scheme developed in Dudek and Leśkow [6].
Źródło:
Opuscula Mathematica; 2009, 29, 3; 229-251
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of the preventive maintenance plan of a series components system with Weibull hazard function
Autorzy:
Duarte, J. C.
Soares, C. G.
Powiązania:
https://bibliotekanauki.pl/articles/2069578.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
availability
hazard function
Weibull distribution
preventive maintenance
series components
Opis:
In this paper we propose an algorithm to calculate the optimum frequency to perform preventive maintenance in equipment that exhibits Weibull hazard function and constant repair rate in order to ensure its availability. Based on this algorithm we have developed another one to solve the problem of maintenance management of a series system based on preventive maintenance over the different system components. We assume that all components of the system still exhibit Weibull hazard function and constant repair rate and that preventive maintenance would bring the system to the as good as new condition. The algorithm calculates the interval of time between preventive maintenance actions for each component, minimizing the costs, and in such a way that the total downtime, in a certain period of time, does not exceed a predetermined value.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 67--73
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A weighted version of Gamma distribution
Autorzy:
Jain, Kanchan
Singla, Neetu
Gupta, Rameshwar
Powiązania:
https://bibliotekanauki.pl/articles/729800.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
gamma distribution
weight function
hazard function
maximum likelihood estimator
Akaike Information criterion
Opis:
Weighted Gamma (WG), a weighted version of Gamma distribution, is introduced. The hazard function is increasing or upside-down bathtub depending upon the values of the parameters. This distribution can be obtained as a hidden upper truncation model. The expressions for the moment generating function and the moments are given. The non-linear equations for finding maximum likelihood estimators (MLEs) of parameters are provided and MLEs have been computed through simulations and also for a real data set. It is observed that WG fits better than its submodels (WE), Generalized Exponential (GE), Weibull and Exponential distributions.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 89-111
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability concept under general uncertainty
Autorzy:
Guo, R.
Cui, Y.
Thiart, C.
Guo, D.
Powiązania:
https://bibliotekanauki.pl/articles/2069525.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
probabilistic reliability
uncertain reliability
uncertain measure
uncertainty lifetime
uncertain hazard function
Opis:
The Toyota crisis is tearing off the brand image of quality and reliability and therefore it is logical to question whether the dominating position of probability theory, on which Japanese quality and reliability engineering practices are established, should be examined. In general, reliability analysis is an exercise under uncertain environment. Foundationally speaking, uncertain modeling is a matter of choosing what kind of uncertain measure as its standing point. In this paper, we introduce the uncertainty reliability concept on the platform of the axiomatic uncertain measure theory and compare it to probabilistic reliability concept based on Kolmogorov’s probability measure theory, on which the traditional quality and reliability engineering is established. It is expecting that a foundational work can be established for a more rigorous reliability engineering and risk analysis under general uncertainty environments.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 105--114
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersive functions and stochastic orders
Autorzy:
Bartoszewicz, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1339146.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
stationary renewal distribution
mean residual life
preservation theorem
partial orders
hazard function
dispersive function
Opis:
Generalizations of the hazard functions are proposed and general hazard rate orders are introduced. Some stochastic orders are defined as general ones. A unified derivation of relations between the dispersive order and some other orders of distributions is presented
Źródło:
Applicationes Mathematicae; 1996-1997, 24, 4; 429-444
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Profit optimalization in operation systems
Autorzy:
Knopik, L.
Migawa, K.
Wdzięczny, A.
Powiązania:
https://bibliotekanauki.pl/articles/258450.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Branching Poisson process
primary failure
secondary failures
gamma distribution
mean profit
hazard function
Opis:
The aim of this study is to analyse the effect of reducing the number of secondary damage to profit from the work of a technical object. Considering the criterion function that describes the average profit from the work of a technical object in the operation system. The study analyses a model of profit optimization, in which the design criterion function is based on the properties of Poisson branch process. Criterion function that describes the average gain is considered in the work at sufficiently general factors. Profit lifting model from the work of a technical facility is numerically exemplified. For the analysed electrical subsystem, intervals of time between the initial damage have exponential distribution, and between secondary damage - gamma distribution. In the presented example, the ability of profit optimization in operation systems of technical objects is demonstrated.
Źródło:
Polish Maritime Research; 2016, 1; 93-98
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the nonparametric estimation of the conditional hazard estimator in a single functional index
Autorzy:
Gagui, Abdelmalek
Chouaf, Abdelhak
Powiązania:
https://bibliotekanauki.pl/articles/2107053.pdf
Data publikacji:
2022-06-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
single functional index
conditional hazard function
nonparametric estimation
α-mixing dependency
asymptotic normality
functional data
Opis:
This paper deals with the conditional hazard estimator of a real response where the variable is given a functional random variable (i.e it takes values in an infinite-dimensional space). Specifically, we focus on the functional index model. This approach offers a good compromise between nonparametric and parametric models. The principle aim is to prove the asymptotic normality of the proposed estimator under general conditions and in cases where the variables satisfy the strong mixing dependency. This was achieved by means of the kernel estimator method, based on a single-index structure. Finally, a simulation of our methodology shows that it is efficient for large sample sizes.
Źródło:
Statistics in Transition new series; 2022, 23, 2; 89-105
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the Inverse Gaussian Process with hazard rate functions-based drifts applied to degradation modelling
Autorzy:
Rodríguez-Picón, Luis Alberto
Méndez-González, Luis Carlos
Pérez-Olguín, Iván JC
Hernández-Hernández, Jesús Israel
Powiązania:
https://bibliotekanauki.pl/articles/2175136.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
inverse Gaussian process
hazard rate function
degradation rate
variable drift
Opis:
The stochastic modelling of degradation processes requires different characteristics to be considered, such that it is possible to capture all the possible information about a phenomenon under study. An important characteristic is what is known as the drift in some stochastic processes; specifically, the drift allows to obtain information about the growth degradation rate of the characteristic of interest. In some phenomenon’s the growth rate cannot be considered as a constant parameter, which means that the rate may vary from trajectory to trajectory. Given this, it is important to study alternative strategies that allow to model this variation in the drift. In this paper, several hazard rate functions are integrated in the inverse Gaussian process to describe its drift in the aims of individually characterize degradation trajectories. The proposed modelling scheme is illustrated in two case studies, from which the best fitting model is selected via information criteria, a discussion of the flexibility of the proposed models is provided according to the obtained results.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 3; 590--602
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agu-Eghwerido distribution, regression model and applications
Autorzy:
Agu, Friday Ikechukwu
Eghwerido, Joseph Thomas
Powiązania:
https://bibliotekanauki.pl/articles/1917110.pdf
Data publikacji:
2021-12-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
AGUE distribution
AGUE regression model
moment generating function
means residual function
hazard rate function
survival rate function
Opis:
Modelling lifetime data with simple mathematical representations and an ease in obtaining the parameter estimate of survival models are crucial quests pursued by survival researchers. In this paper, we derived and introduced a one-parameter distribution called the Agu-Eghwerido (AGUE) distribution with its simple mathematical representation. The regression model of the AGUE distribution was also presented. Several basic properties of the new distribution, such as reliability measures, mean residual function, median, moment generating function, skewness, kurtosis, coefficient of variation, and index of dispersion, were derived. The estimation of the proposed distribution parameter was based on the maximum likelihood estimation method. The real-life applications of the distribution were illustrated using two real lifetime negatively and positively skewed data sets. The new distribution provides a better fit than the Pranav, exponential, and Lindley distributions for the data sets. The simulation results showed that the increase in parameter values decreases the mean squared error value. Similarly, the mean estimate tends towards the true parameter value as the sample sizes increase.
Źródło:
Statistics in Transition new series; 2021, 22, 4; 59-76
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended Lognormal Distribution: Properties and Applications
Autorzy:
Lahcene, Bachioua
Powiązania:
https://bibliotekanauki.pl/articles/1030771.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Characteristics and Survival Function
Generating and Quantile Functions
Hazard Rate Function
Lognormal Distribution
Mixture
Model
Opis:
This paper is devoted to study a form of lognormal distributions family and introduce some of its basic properties. It presents new derivate models that find many applications will be useful for practitioners in various fields. The abstract explores some of the basic characteristics of the family of abnormal distributions and provides some practical methods for analyzing some different applied fields related to theoretical and applied statistical sciences. The proposed model allows for the improvement of the relevance of near-real data and opens broad horizons for the study of phenomena that can be addressed through the results obtained. This study is devoted to a review of fitting data, discuss distribution laws for models and describe the approaches used for parameterization and classification of models. Finally, a set of concluding observations has been developed to track the mix distributions and their adaptation mechanisms.
Źródło:
World Scientific News; 2020, 145; 16-30
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized extended Marshall-Olkin family of lifetime distributions
Autorzy:
Goldoust, Mehdi
Mohammadpour, Adel
Powiązania:
https://bibliotekanauki.pl/articles/2034093.pdf
Data publikacji:
2022-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
compound distribution
hazard rate function
lifetime distribution
maximum likelihood estimation
power series distribution
Opis:
We introduce a new generalized family of nonnegative continuous distributions by adding two extra parameters to a lifetime distribution, called the baseline distribution, by twice compounding a power series distribution. The new family, called the lifetime power series-power series family, has a serial arrangement of parallel structures, which extends the Marshall and Olkin structure. Four special models are discussed. A mathematical treatment of the new distributions is provided, including ordinary and incomplete moments, quantile, moment generating and mean residual functions. The maximum likelihood estimation technique is used to estimate the model parameters and a simulation study is conducted to investigate the performance of the maximum likelihood estimates. Its applicability is also illustrated by means of two real data sets.
Źródło:
Statistics in Transition new series; 2022, 23, 1; 55-74
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piecewise reliability-dependent hazard rate for composites under fatigue loading adjustment
Konstrukcja funkcji ryzyka uszkodzeń kawałkami zależnej od niezawodności dla kompozytów poddanych różnym scenariuszom obciążenia zmęczeniowego
Autorzy:
Chen, C.-L.
Wang, K.-S.
Powiązania:
https://bibliotekanauki.pl/articles/281955.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fatigue loading adjustment
hazard rate function
dynamical reliability
Monte Carlo simulation
linear damage sum
Opis:
Based on the derived transition period and reliability drop, this paper proposes a method of piecewise combination of the reliability-dependent hazard rate function named (eocp) model to describe the dynamical reliability in a two-stage fatigue loading process. First, the parameters eo, c, p are fitted through simulated failure data under various constant- amplitude cyclic stresses. The reliability of the high-low loading process is described piecewise with the corresponding values of (eo, c, p) for each respective stress level, and maintains Ra in the transition period while Ra denotes the reliability at which the stress level changes. The reliability of the low-high process is determined by subtracting the portion of reliability drop at Ra from the piecewise fitted curves. The proposed reliability behavior is verified successfully. The linear damage sum is found to be larger than unity for the high-low loading, and on the contrary for the low-high cases. A larger difference between the stress level changed results in larger deviation of damage sum from unity, especially when Ra near 0.9.
W oparciu o wyznaczony okres przejściowy i spadek niezawodności, artykuł prezentuje metodę określania funkcji ryzyka uszkodzenia kawałkami zależnej od poziomu niezawodności, zwanej (eocp) i służącej do modelowania dynamicznej niezawodności dla dwustanowych procesów obciążania zmęczeniowego. Na poczatku, parametry eo, c, i p dopasowano do danych otrzymanych w drodze symulacji uszkodzeń pod wpływem działania cyklicznych naprężeń o kilku stałych amplitudach. Niezawodność dla obciążeń przechodzących od dużej amplitudy do małej opisano kawałkami zależnymi od poziomu przykładanych naprężeń i odpowiadającymi im wartościami eo, c, i p. Wynosi ona Ra w okresie przejściowym, gdzie Ra jest niezawodnością, przy której poziom naprężeń jest zmieniany. Niezawodność przy obciążeniu rosnącym wyznaczono, odejmując część jej spadku przy Ra od kawałkami dopasowanych krzywych. Zaproponowany sposób opisu niezawodności sukcesywnie weryfikowano. Zaobserwowano, że liniowa suma uszkodzeń przekracza jedność dla scenariusza obciążeń stopniowo malejących i nie osiąga tej wartości w przypadku przeciwnym. Większe różnice w poziomach obciążeń skutkowały w większych odstępstwach liniowej sumy uszkodzeń od jedności. Szczególnie duże zauważono dla Ra = 0.9.
Źródło:
Journal of Theoretical and Applied Mechanics; 2012, 50, 1; 231-250
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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