Populations and samples

Xem 1-20 trên 107 kết quả Populations and samples
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Work life of persons with asthma, rhinitis, and COPD: A study using a national, population-based sample

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  • Although the studies differ in population coverage, sample design, method and periodicity of measurement, use of proxies, and treatment of nonresponse and missing data, the authors conclude that most analyses using data from the post- 1980 period show declines in the percentage with moderate disability and IADL disability. These declines have been shown to vary by gender (18, 47) and level of education (18); and they also differ between the young-old and the old-old (19). Generally, there is more improvement in less-severe disability....

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  • The objective of this Work Area has been to undertake a detailed and itemised analysis based on population and sample analyses of the loan portfolios of the 14 banking groups included in the scope of the independent evaluation. This work has been undertaken by the four largest audit firms in Spain (Deloitte, PwC, Ernst & Young and KPMG). The 14 banking groups included in the exercise were assigned to each audit firm, and none of the audit firms reviewed banks audited by them in the last two financial years, in order to guarantee their independence. The assignment of...

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  • In this chapter, students will be able to: Learn the financial and statistical issues in the determination of sample size, discover the methods for determining sample size, gain an appreciation of a normal distribution, understand population, sample, and sampling distribution, distinguish between point and interval estimates, recognize problems involving sampling means and proportions.

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  • As Chen [16] correctly pointed out, there are “many conflicting... (MRI)... findings in individuals within the ASD...(which result from)...factors such as population age, MRI acquisition parameters, details of the image processing pipeline, feature extraction procedures, analy- tic methods used to detect group differences and sample sizes...(which have)...contributed to these disparities...”.

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  • As resources become scarce, they become more valuable. Value is evidenced both by the increasing prices of resources and by controversy over resource allocation and management. From forest harvesting and land use conversion throughout North America, to the fragmentation of tropical bird habitat, to acid rain deposition in Eastern Europe, to Siberian tiger habitat loss in Russia, people have significantly affected the ecosystems of the world. Expanding population pressures continue to cause the price of resources to increase and to intensify conflicts over resource allocation....

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  • Subsequently, the 1996 Nepal Family Health Survey, the 2001 Nepal Demographic and Health Survey and the 2006 Nepal Demographic and Health surveys were conducted. This trend report discusses key findings from these three DHS surveys in Nepal. All three Nepal DHS surveys sampled nationally representative populations, were conducted by the same organization (New ERA Ltd.), and managed by the same core group of survey personnel.

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  • This study of a large, nationally representative sample of Australian women who had recently given birth provides the first examination of consultancy patterns across conventional maternity care providers and CAM practitioners during pregnancy. The study presents four key findings. First, the study reveals a substantial level of CAM practitioner use with nearly half of the pregnant women consulting a CAM practitioner concurrent to conventional maternity care.

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  • The objective of this study was to investigate the impact of oral health conditions on the quality of life of elderly people in Joaçaba - SC, in Southern Brazil. A survey based on systematic sampling of clusters was carried out with 183 elderly people that belong to old age groups. The survey was conducted in order to assess the oral conditions of the participants (use of and need for prosthesis) based on the criteria from the World Health Organization publication “Oral Health Surveys, Basic Methods”, 4th edition. The oral health impact profile (OHIP) was used to evaluate the impact of...

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  • Statistics has evolved into a very important discipline that is applied in many fields. In the modern age of computing, both statistical methodology and its applications are expanding greatly. Among the many areas of application, we (Friis and Chernick) have direct experience in the use of statistical methods to military problems, space surveillance, experimental design, data validation, forecasting workloads, predicting the cost and duration of insurance claims, quality assurance, the design and analysis of clinical trials, and epidemiologic studies....

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  • For comparing Aussiedler incidence and mortality with the German/Saarland population, indirect standardization was used. Compared to the method of direct standardization, the indirect method is advantageous when the stratum-specific rates of one of the populations to be compared are based on small numbers. In this case one can use the more stable rates of the larger population for the indirect standardization, thus gaining robustness with regard to sampling variation (Breslow and Day, 1987).

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  • Tuberculosis (TB) is one of the world’s most important infectious causes of morbidity and mortality among adults. An estimated one-third of the world’s population is infected with TB. In 2010, there were 8.8 million new, and 12.0 million prevalent cases of TB; 1.1 million deaths occurred among HIV-uninfected people and an additional 0.35 million deaths among HIV-infected people (WHO 2011a). Of the total new TB cases, an estimated 12% to 14% occurred among people living with HIV.

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  • Tham khảo sách 'biostatistics a methodology for the health sciences second edition', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The increased rates of obesity have become a public health concern because obesity is associated with chronic disease and adverse health outcomes (Institute of Medicine 2005). Furthermore, because obesity is now a characteristic of populations and not only of individuals, researchers, government health organizations, and advocacy groups characterize obesity as an epidemic (Institute of Medicine 2005, 2006a; World Health Organization 2003).

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  • We measured and tested whether the following variables affect walking (basis: 200m buffer around each child's shortest walking path): number of busy intersections crossed, intersection and street density, total daily vehicle-miles traveled, average vehicle speed along the route, population density, and land use (R Wilson, 2008). Sidewalk coverage data do not exist for Roseville and could not be tested in the model. We refined the model through systematic testing of independent variables as the differ- ence in log-likelihood ratios.

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  • When running in isolation, Workload-A is able to uti- lize the 1 GB cache effectively and this results in an average storage access latency of 4.4ms. On the other hand, Workload-B does not benefit from the cache, re- sulting in an average storage access latency of 85.1ms. When the two workloads are run concurrently with un- controlled resource sharing, the larger Workload-B domi- nates the smallerWorkload-A at both cache and disk levels. This results in a factor of 6 slowdown for Workload-A and a factor of 4 slowdown for Workload-B.

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  • The resulting list of food items, which could be viewed as an example of a ‘shopping list’ for a week, was used to create a seven-day sample menu to demonstrate that food could be combined into a recognisable and varied diet, with examples of the type of meals. The menu was only an illustration as there are many different ways in which the food could be combined and therefore should not be interpreted as a definitive diet. There are many different combinations of food that could meet dietary recommendations and GHGE targets; substitution of food in the list could take...

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  • The survey was conducted in two phases. In the first phase, the survey covered the basic population information and community environment of the sample units, whereas the second involved the knowledge, attitude and practices of women of childbearing age in regards to childbirth, contraception and repro- ductive health, their demands for family planning and services related to daily life and production. In the first phase of the survey, a probability proportional sampling method was adopted to sort out 1041 sample units in 337 counties/ cities/districts across the country.

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  • The sample for the 2010 RDHS was designed to provide population and health indicator estimates for the country as a whole and for urban and rural areas. Survey estimates can also be reported for the provinces (South, West, North, and East provinces) and Kigali City. The results presented in this report show key indicators that correspond to these provinces and Kigali City. A representative sample of 12,972 households was selected for the 2010 RDHS. The sample was selected in two stages.

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  • Chapter 8 provides knowledge of sampling methods and central limit theorem. When you have completed this chapter, you will be able to: Explain under what conditions sampling is the proper way to learn something about a population, describe methods for selecting a sample, define and construct a sampling distribution of the sample mean,...

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