On some generalized ageing orderings

Some partial orderings which compare probability distributions with the expo- nential distribution, are found to be very useful to understand the phenomenon of ageing. Here, we introduce some new generalized partial orderings which de- scribe the same kind of characterization of some generalized ageing classes. We give some equivalent conditions for each of the orderings. Inter-relations among the generalized orderings have also been discussed

On hypergeometric generalized negative binomial distribution

It is shown that the hypergeometric generalized negative binomial distribution has moments of all positive orders, is overdispersed, skewed to the right, and leptokurtic. Also, a three-term recurrence relation for computing probabilities from the considered distribution is given. Application of the distribution to entomological field data is given and its goodness-of-fit is demonstrated

Estimation of the scale parameter of gamma model in presence of outlier observations

This paper considers the Bayesian point estimation of the scale parameter for a two-parameter gamma life-testing model in presence of several outlier observations in the data. The Bayesian analysis is carried out under the assumption of squared error loss function and fixed or random shape parameter

Cost-effectiveness of EGCRISC application versus hepatitis C virus mass screening in Egypt

Background: The Egyptian model of care against hepatitis C virus (HCV) has a great success in treatment and treatment accessibility, but still screening efforts must be strengthened. HCV is a silent infection when most of infected people are unaware of their infection. EGCRISC is a newly developed and validated risk-based HCV screening tool in Egypt that has shown a considerably good performance but is still underused. This brief communication is to analyze its use cost-effectiveness versus mass screening. Study design: Mathematical comparative analysis for economic evaluation. Methods: Its performance data as published recently were used, and a minimum cost of L.E. 20 was considered per one antibody testing. The 2015 health issue survey and population census were used for estimating the population, infected individuals and susceptibles. Results: The analysis showed that using EGCRISC would save LE 0.43 billion accounting for about 21,646,227 unnecessary tests, while missing less than 70,000 cases when compared to mass screening. Conclusion: EGCRISC is a cost-effective tool that must be adopted nationwide as soon as possible in Egypt for the best outcome of HCV control. Keywords: HCV, EGCRISC, Cost-effectiveness, Screenin