Search results for "Variation"
showing 10 items of 2124 documents
Regional differences in returns to education for entrepreneurs versus wage earners
2010
Many studies suggest that rates of return to schooling are lower for entrepreneurs than for employees, although the opposite has also been reported. This paper analyses the returns to education for entrepreneurs in urban and rural regions in Finland and compares these to the returns for wage earners. These areas show different rates of self-employment, higher rates being found in rural areas and lower rates in urban areas. The analysis is based on a rich, register-based dataset that includes a 7% random sample of all Finns. To avoid potential sources of bias, Mincer-type income equations are estimated using different estimation procedures. The results show regional variation in returns to e…
GENETIC AND ENVIRONMENTAL VARIATION IN PERCEIVED EXERTION AND HEART RATE DURING BICYCLE ERGOMETER WORK
1977
The relative contributions of heredity and environment to the variance in heart rate (HR) and rating of perceived exertion (RPE) during the bicycle ergometer work were studied with 14 pairs of male (6 monozygous (MZ) and 8 dizygous (DZ)) and 22 pairs of female (8 MZ and 14 DZ) twins ranging in age from 11 to 20 years. The results showed for both sexes that no significant differences in the intrapair variances of HR and RPE could be observed between the MZ and DZ twin samples. Thus it was concluded that in contrast to several other parameters of the measurements of the physical work capacity HR and RPE are not influenced to any significant degree by the genetic factors.
The Development of Conditional Reasoning: A Mental Model Account
2002
Abstract Conditional (if-then) reasoning is one of the key components of logical reasoning. Studies examining the way that children and adults make conditional inferences have shown that while there are some clear developmental patterns, there is also a great deal of variation in performance due to factors such as problem content. Such variation is difficult to model without an explicit process model. In the following we propose a variant of mental model theory (Johnson-Laird, 1983) that can explain much of the empirical data. This model suggests that the development of conditional reasoning can be explained, at least partly, by such factors as the capacity of working memory, the range of k…
Mixed finite elements for nonlocal elastic multilayered composite plate refined theories
2020
Abstract A novel mixed finite element formulation for the layerwise analysis of nonlocal multilayered composite plates is presented. The finite elements are formulated starting from the weak form of a set of governing equations for the laminate layers that were deduced via the Reissner Mixed Variational Theorem. The primary variables, namely displacements and out-of-plane stresses, are expressed at layer level as through-the-thickness expansions of suitable selected functions with coefficients approximated by the finite element scheme. The through-the-thickness expansion order is considered as a free parameter. This way, finite elements for different refined higher order plate theories can …
Genetic variants linked to myopic macular degeneration in persons with high myopia: CREAM Consortium.
2019
Purpose: To evaluate the roles of known myopia-associated genetic variants for development of myopic macular degeneration (MMD) in individuals with high myopia (HM), using case-control studies from the Consortium of Refractive Error and Myopia (CREAM). Methods: A candidate gene approach tested 50 myopia-associated loci for association with HM and MMD, using meta-analyses of case-control studies comprising subjects of European and Asian ancestry aged 30 to 80 years from 10 studies. Fifty loci with the strongest associations with myopia were chosen from a previous published GWAS study. Highly myopic (spherical equivalent [SE] ≤ -5.0 diopters [D]) cases with MMD (N = 348), and two sets of cont…
Family Register in British English: The First Approach to its Systematic Study
2015
The present study looks into an unexplored area of research as it is the family register. An alternative to recording family conversations is the use of popular TV series, as their success lies in the audience s identification with their characters and their communicative style. This work analyses two highly popular series in UK. The results suggest that this register has its own communicative richness and internal variation, the knowledge of which may be of great help for students and professionals travelling to English-speaking countries and living or relating with native speakers in family environments.
Tuition fees and student effort at university
2018
Abstract This paper presents theoretical and empirical evidence that an increase in tuition fees may boost university students’ academic effort. We examine the tuition fee rise introduced in 2012 by Spanish universities, where students register and pay for their chosen modules and fees increase each time students retake a module until they pass it. Data refer to students of economics, business and medicine at the University of Valencia during 2010–2014. The fact that some students pay fees in full while others are exempt from payment provides an identifying source of variation that we exploit using a flexible difference-in-differences methodology.
Phrase frames in English pharmaceutical discourse a corpus-driven study of intradisciplinary register variation
2015
Focusing on the exploration of intra-disciplinary register variation in the pharmaceutical domain, this corpus-driven study attempts to describe the use, composition and discourse functions of phrase frames, that is, contiguous sequences of words identical except for one (Fletcher, 2002-2007), found in samples of four English pharmaceutical text types, such as patient information leaflets, summaries of product characteristics, clinical trial protocols and chapters/sections from academic textbooks on pharmacology. The study deals with a specific sub-type of phrase frames, that is, 4-word units with a variable slot in the medial position, e.g. be * with caution, to take * medicine. The result…
Keywords and lexical bundles within English pharmaceutical discourse: A corpus-driven description
2015
Abstract Little attention has been paid so far to keywords and lexical bundles used in the English language typical of the pharmaceutical field. Conducted from a register-perspective (Biber & Conrad, 2009), this exploratory and descriptive research is intended to fill in the gap in corpus linguistics studies on phraseology and register variation within written English pharmaceutical discourse. More specifically, this empirical study presents a corpus-driven description of the use and functions of keywords (top-50 by keyness) complemented by a similar description of lexical bundles (top-50 by frequency) used across samples of patient information leaflets, summaries of product characteristics…
Corpus Analysis and Register Variation: a field in need of an update
2013
Abstract This study reviews the development of research on register variation (RV) over the last century to the present, emphasizing the influence of corpus analyses on its greatest advances and also on its major weaknesses and ambiguities. In search of practical and useful methods to analyse language registers, in the second part of the paper, the authors sketch a different approach to RV which has been used over the last ten years in language teaching at university level and professional communication training.