The efficiency of three statistical models, AHP surface-weighted density bivariate (semi-quantitative models), stepwise multivariate regression and logistic multivariate regression models were compared in Chehel-Chai watershed in Golestan province, Iran. In current study the hazard map was prepared according to the top model of landslide hazard map. Chehel-Chai watershed is located as one of Go...

data utilized in this study were 6800 records of lambs’ life longevity, and survival rate from 263 sires and 1839 dams collected from 1989 through 2009, from the lori-bakhtiari flock at shooli station in shahrekord. the data were analyzed, using linear and hazard ratio models along with weibul function. these models included such non genetic factors as year and month of birth, sex of lamb, type...

A hazard rate λ(t) is assumed to be of the shape of the “first” part of a “bathtub” model, i.e., λ(t) is non-increasing for t < τ and is constant for t ≥ τ . The isotonic maximum likelihood estimator of the hazard rate is obtained and its asymptotic distribution is investigated. This leads to the maximum likelihood estimator and a confidence interval for a new version of the change point parame...

This paper deals with the Bayesian inference of the linear hazard rate (LHR) distribution under a progressively censoring scheme. A unified treatment of both Type I and Type II censoring is presented under independent gamma priors for the parameters, that yields the posteriors as mixtures of gamma. The priors are motivated from a probability matching viewpoint. Along with marginal inference and...

In this paper, two-component systems (parallel and series) with stochastically dependent components are considered. The aim is to investigate an ordering relation according to their hazard rates among the lifetime of the system with dependent and independent components, and the lifetime of the component. In addition, monotonicity of the hazard rate of two-component system for a bivaritate expon...

Increasing usage of petroleum-based insulating oils in electrical apparatus has led to increase pollution and, at the same time, adversely affect life apparatus. This increases demand Mineral Oil (MO), which is on verge extinction and leads conducting tests natural esters. work discusses dielectric endurance Marula (MRO), a ester modified using Conductive Nano Particle (CNP) replace for power t...

Recently, several attempts have been made to define new models that extend well-known distributions and at the same time provide great flexibility in modelling real data. We propose a new four-parameter model named the Weibull-power function (WPF) distribution which exhibits bathtub-shaped hazard rate. Some of its statistical properties are obtained including ordinary and incomplete moments, qu...

Standard inference procedures assume a random sample from a population with density fθ(x) for estimating the parameter θ. However, there are many applications in which the available data are a biased sample instead. Fisher modeled biased sampling using a weight function w(x) ≥ 0, and constructed a weighted distribution with a density f θ (x) that is proportional to w(x)fθ(x). In this paper, we ...