VOLUME 19 , ISSUE 3 (September 2018) - List of articles

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DEVELOPING SINGLE-ACCEPTANCE SAMPLING PLANS BASED ON A TRUNCATED LIFETIME TEST FOR AN ISHITA DISTRIBUTION

Amjad D. Al-Nasser/ Amer I. Al-Omari/ Ahmed Bani-Mustafa/ Khalifa Jaber

Acceptance sampling plans are statistical procedures that are used for quality control and improvement in cases where it is not possible to test every item in a lot of materials. The outcome of this test determines whether the entire lot is accepted or rejected based on a random sample. In this procedure, an important characteristic of the materials is their lifetime sampling distribution, and this can vary from sample to sample. In this article, a new lifetime distribution, known as an Ishita d(..)

DOI: 10.21307/stattrans-2018-022

THE ROLE OF BREASTFEEDING VIS-À-VIS CONTRACEPTIVE USE ON BIRTH SPACING IN INDIA: A REGIONAL ANALYSIS

Laxmi Kant Dwivedi

Birth spacing is one of the important aspects of reproductive health. Therefore, it is felt by demographers that birth spacing needs to be studied from time to time in view of the epidemiological transition taking place worldwide. Using the third round of National Family Health Survey-3 data, the central hypothesis of this paper is to find out the relative advantages of breastfeeding over other methods of contraception among non-sterilized women by using simulative approach of the Cox regression(..)

DOI: 10.21307/stattrans-2018-023

DEALING WITH HETEROSKEDASTICITY WITHIN THE MODELING OF THE QUALITY OF LIFE OF OLDER PEOPLE

Katarzyna Jabłońska

Using the estimation method of ordinary least squares leads to unreliable results in the case of heteroskedastic linear regression model. Other estimation methods are described, including weighted least squares, division of the sample and heteroskedasticity-consistent covariance matrix estimators, all of which can give estimators with better properties than ordinary least squares. The methods are presented giving the example of modelling quality of life of older people, based on a data set from (..)

DOI: 10.21307/stattrans-2018-024

SPATIAL MEASURES OF DEVELOPMENT IN EVALUATING THE DEMOGRAPHIC POTENTIAL OF POLISH COUNTIES

Anna Majdzińska

The study presents a demographic potential-based typology of Polish counties created using the spatial measures of development (available in the literature and proposed by the author). The typology reveals the location of Polish areas (regions) with the highest and lowest demographic potential.The analysis was performed on data sourced from the publications of the Central Statistical Office (GUS) on the age structure and selected developments in the natural movement and migrations in counties in(..)

DOI: 10.21307/stattrans-2018-025

ANOTHER LOOK AT THE STATIONARITY OF INFLATION RATES IN OECD COUNTRIES: APPLICATION OF STRUCTURAL BREAK-GARCH-BASED UNIT ROOT TESTS

OlaOluwa S. Yaya

The need to understand the stationarity property of inflation of any country is paramount in the design of monetary targeting policy. In this paper, unit root hypotheses of inflation rates in 21 OECD countries are investigated using the newly proposed GARCH-based unit root tests with structural break and trend specifications. The results show that classical tests over-accept unit roots in inflation rates, whereas these tests are not robust to heteroscedasticity. As it is observed from the pre-te(..)

DOI: 10.21307/stattrans-2018-026

DISCRIMINANT COORDINATES ANALYSIS IN THE CASE OF MULTIVARIATE REPEATED MEASURES DATA

Mirosław Krzyśko/ Wojciech Łukaszonek/ Waldemar Wołyński

The main aim of the paper is to adapt the classical discriminant coordinates analysis to multivariate repeated measures data. The proposed solution is based on the relationship between the discriminant coordinates and canonical variables. The quality of these new discriminant coordinates is examined on some real data.

DOI: 10.21307/stattrans-2018-027

A MATHEMATICAL PROGRAMMING APPROACH FOR OBTAINING OPTIMUM STRATA BOUNDARIES USING TWO AUXILIARY VARIABLES UNDER PROPORTIONAL ALLOCATION

Faizan Danish

Optimum stratification is the method of choosing the best boundaries that make the strata internally homogenous. Many authors have attempted to determine the optimum strata boundaries (OSB) when a study variable is itself a stratification variable. However, in many practical situations fetching information regarding the study variable is either difficult or sometimes not available. In such situations we find help in the variable (s) closely related to the study variable. Using auxiliary informat(..)

DOI: 10.21307/stattrans-2018-028

COMPARISON OF DIABETIC NEPHROPATHY ONSET TIME OF TWO GROUPS WITH LEFT TRUNCATED AND RIGHT CENSORED DATA

Alka Sabharwal/ Gurprit Grover

The present paper is concerned with the comparison of the nephropathy onset time of type-2 diabetic patients, grouped on the basis of gender and age at the time of diabetes diagnosis. Diabetic Nephropathy (DN) onset time is assumed to follow Weibull distribution with fixed left truncation. The likelihood ratio test is applied on uncensored cases and Thoman and Bain two sample tests is applied with generated left truncated Weibull distributions. To avoid the model validity issues for left truncat(..)

DOI: 10.21307/stattrans-2018-029

CHANNEL PERFORMANCE UNDER VENDOR MANAGED CONSIGNMENT INVENTORY CONTRACT WITH ADDITIVE STOCHASTIC DEMAND

Milena Bieniek

Consignment as the shifting of the inventory ownership to a supplier is widely implemented in virtual market. In this form of business arrangement the supplier places goodsataretailer’slocationwithoutreceivingpayment,untilthegoodsaresold. We consider a single period supply chain model, where the supplier contracts with the retailer with some probability of return. Market demand is additive, linearly price– dependent and uncertain. We focus on vendor managed consignment inventory (VMCI)channel,in(..)

DOI: 10.21307/stattrans-2018-030

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