The estimation of the difference of means of two variables is studied when missing observations are present. The model follows the approach proposed in the paper of Bouza and Prabhu-Ajgaonkar [1993, Biometrical J., v.35, p.245-252] when simple random sampling is the design used for selecting samples and sub-samples. In this paper, a ranked set-sampling counterpart is developed. Their sample err...

BACKGROUND This study aimed to assess undernutrition and associated factors among 24-36-month-old children in the slum areas of Bahir Dar city. METHODS A community-based cross-sectional study was conducted among 480 children from May 1 to 26, 2015. The simple random sampling technique was used to select respondents. Data were collected using a structured interviewer-administered questionnaire...

Abstract: In this paper we have suggested a general procedure for estimating the population mean through defining a class of estimators. Many of the existing estimators are shown particular members of the proposed class of estimators. It has been shown to the first degree of approximation that mean squared error (MSE) of the proposed class of estimators are better than the competing ratio, regr...

The studies of Reliability Generalization (RG) analyze estimates of the reliability of scores from a test provided by a set of studies. As their goals and designs are usually very varied, the sampling of individuals obeys very different schemas. Thus, the variances of the scores might be more heterogeneous than expected from random sampling. Two main problems associated with this potential sour...

Inversions are among the most common mutations acting on the order and orientation of genes in a genome, and polynomial-time algorithms exist to obtain a minimal length series of inversions that transform one genome arrangement to another. However, the minimum length series of inversions (the optimal sorting path) is often not unique as many such optimal sorting paths exist. If we assume that a...

This research is the first empirical attempt to calculate the various components of the hidden bias associated with the sampling strategies routinely-used in human genetics, with special reference to surname-based strategies. We reconstructed surname distributions of 26 Italian communities with different demographic features across the last six centuries (years 1447-2001). The degree of overlap...

OBJECTIVE The study was conducted to assess clients' satisfaction with PMTCT services on privacy, waiting time and counselling in PMTCT of HIV /AIDS in Dodoma Rural district. METHODS A cross sectional study was conducted to 208 women assessing Reproductive Child Health (RCH) and PMTCT of HIV services. Data collection method involved both client exit interviews and focus group discussions (FGD...

Objective. The aim of this study was to find out the prevalence of overweight and obesity among adolescents in seven Arab countries using similar reference standard. Methods. A school-based cross-sectional study was carried out in seven cities in Arab countries, namely, Algeria, Jordan, Kuwait, Libya, Palestine, Syria, and United Arab Emirates. A multistage stratified random sampling technique ...

BACKGROUND The Health Promoting School (HPS) approach provides a strong foundation to improve students' overall health, including psychological well-being, which has its roots in resilience. The present study evaluates the effectiveness of a resilience-enhancing programme, building on the concept of HPS among a Chinese population. METHODOLOGY All mainstream schools in a socially disadvantaged...