BACKGROUND Even a well-designed randomized control trial (RCT) study can produce ambiguous results. This article highlights a case in which full-sample results from a large-scale RCT in the United Kingdom differ from results for a subsample of survey respondents. OBJECTIVES Our objective is to ascertain the source of the discrepancy in inferences across data sources and, in doing so, to highl...

The U.S. Census Bureau reports that Hispanics are the country's largest and fastest growing minority, representing about 14.4 percent of the population in 2005 (Census Bureau 2006b). By 2050, Hispanics will account for an estimated 24.4 percent of the population--or 1 in every 4 persons in the United States (Census Bureau 2004, Table 1 a). The Hispanic population tends to be younger than the ov...

Researchers interested in the relationships between place and health have been slow to incorporate a life course perspective, probably due to the lack of readily available historical environmental data. This hinders the identification of causal relationships. It also restricts our understanding as to whether there are accumulative effects over the life course and if there are critical periods i...

this research project was conducted to evaluate bioavailability and chemical properties of different zinc sources in broiler chickens when fed by practical diets. for that, 312 day-old male ross 308 broiler chicks were fed from 8-28 day to estimate the biological availability of four zinc sources. chicks were allocated randomly to 13 experimental diets in a 3 × 4 factorial design. diets include...

uniform linear array (ula)-based tapped-delay line (tdl) structure has good performance metrics when the signal sources are located at the middle angles. it offers poor performance when the signal sources are close to the array endfire. in this paper, a new approach is proposed which offers higher performance and desired beamforming on tdl structure when the wideband uncorrelated radio sources ...

language textbooks are conventionally expected to develop the four language macro-skills, including listening, reading, writing and speaking in language learners. however, mastering the reading skill is of particular importance, since it enhances the comprehension of specialized texts in students. the objective of this research is to investigate the scientific aspect of persian textbooks in tea...

In this paper we present a novel approach to integrate non-structured and structured sources of biomedical information. We part from previous research on database integration conducted in the context of the EC funded INFOGENMED project. In this project we developed the ONTOFUSION system, which provides a robust framework to integrate large sets of structured biomedical sources. Methods and tool...

This paper looks into the overall energy pattern in rural China and the possible reasons behind based on an assessment of available data sources. Commercial energy consumption by rural residents is disproportionately lower than that by their urban counterparts. Moreover, biological matters are the dominant source of household fuels in rural areas. Variations in energy consumption are closely re...

BACKGROUND Marriage histories are a valuable data source for investigating nuptiality. While researchers typically acknowledge the problems associated with their use, it is unknown to what extent these problems occur and how marriage analyses are affected. OBJECTIVE This paper seeks to investigate the quality of marriage histories by measuring levels of misreporting, examining the characteris...

This article asks whether information about immigrants beyond their age, education, and years since migration can be productively used to project their earnings. Although many factors could affect immigrant earnings, what is most useful for Social Security modelling purposes is relevant information that is readily available on a continuous basis. Country of origin is a good candidate, as it is ...