首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 281 毫秒
1.
The labour market rewards for a number of required human capital competences are analysed using a sample of young European higher education graduates. Factor analysis is applied to classify competences by jobs into eight orthogonal groups, namely participative, methodological, specialised, organisational, applying rules, physical, generic and socio-emotional competences. Estimates for the total rewards for competences are obtained through conventional wage regression, whereas estimates of the total rewards are derived in terms of job satisfaction through ordered logit regression. Explanatory variables include personal characteristics, job attributes, occupational titles, fields of study, type of higher education institution and country dummies. Results on wage rewards show that jobs with higher requirements of participativeand methodological competencesare best paid; conversely, jobs with higher requirements of organisational, applying-rulesand physical competencesare worse paid. Results on total rewards suggest that jobs with higher requirements of competences increase graduates' satisfaction, the only exception being applying-rules competences.  相似文献   

2.
Amitabha Ghosh 《Resonance》2009,14(12):1153-1165
F = ma is the most frequently used equation in both science and engineering. However, not many are very familiar with the evolutionary process through which the equation finally emerged. This article presents a brief account of the origin of the modern concept of force-matter interaction and the transitory concepts. Towards the end, the article also takes up some still-to-be-resolved matters associated with the equation.  相似文献   

3.
Abstract

The labour market rewards for a number of required human capital competences are analysed using a sample of young European higher education graduates. Factor analysis is applied to classify competences by jobs into eight orthogonal groups, namely participative, methodological, specialised, organisational, applying rules, physical, generic and socio‐emotional competences. Estimates for the total rewards for competences are obtained through conventional wage regression, whereas estimates of the total rewards are derived in terms of job satisfaction through ordered logit regression. Explanatory variables include personal characteristics, job attributes, occupational titles, fields of study, type of higher education institution and country dummies. Results on wage rewards show that jobs with higher requirements of participative and methodological competences are best paid; conversely, jobs with higher requirements of organisational, applying‐rules and physical competences are worse paid. Results on total rewards suggest that jobs with higher requirements of competences increase graduates’ satisfaction, the only exception being applying‐rules competences.  相似文献   

4.
There is consensus in the statistical literature that severe departures from its assumptions invalidate the use of regression modeling for purposes of inference. The assumptions of regression modeling are usually evaluated subjectively through visual, graphic displays in a residual analysis but such an approach, taken alone, may be insufficient for assessing the appropriateness of the fitted model. Here, an easy‐to‐use test of the assumption of equal variance (i.e., homoscedasticity) as well as model specification is provided. Given the importance of the equal‐variance assumption (i.e., if uncorrected, severe violations preclude the use of statistical inference and moderate violations result in a loss of statistical power) and given the fact that, if uncorrected, a misspecified or underspecified model could invalidate an entire study, the test developed by Halbert White in 1980 is recommended for supplementing a graphic residual analysis when teaching regression modeling to business students at both the undergraduate and graduate levels. Using this confirmatory approach to supplement a traditional residual analysis has value because students often find that graphic displays are too subjective for determining what constitutes severe from moderate departures from the equal variance assumption or for assessing patterns in plots that might indicate model misspecification or underspecification.  相似文献   

5.
This study investigated the hypothesis that vocabulary influences word recognition skills indirectly through set for variability, the ability to determine the correct pronunciation of approximations to spoken English words. One hundred forty children participating in a 3-year longitudinal study were administered reading and reading-related measures at four time points. Hierarchical regression and path analyses indicated that vocabulary and phonemic awareness made independent contributions to variance in set for variability; that vocabulary directly influenced future reading comprehension and indirectly influenced future decoding and word recognition through set for variability; and that set for variability influenced future reading comprehension indirectly through both decoding and word recognition, controlling for autoregressive effects.  相似文献   

6.
In recent years, much concern has been expressed about the quality of instruction provided by foreign teaching assistants (TAs) in higher education. Critiques of the use of foreign TAs generally argue that they often impede the learning process because of language barriers. The present study examines the effect that nonnative English-speaking TAs had on student performance over five semesters at the University of Wisconsin-Madison. Multiple ordinary least squares regression is used to analyze the relationship between student grades and nonnative English-speaking TAs. Subsamples based on a TA's geographic region of origin and instructional area are also analyzed. In addition, course drop rates and the impact of TA training programs are examined to determine possible influence on the results. The results of the analysis consistently indicate slightlybetter performance in sections conducted by nonnative English-speaking TAs.  相似文献   

7.
In order to explore the relationship between recollected experiences in one's family of origin and changes in marriage following the birth and rearing of a new baby, data collected as part of a larger and more extensive study of infant and family development were analyzed. Multiple regression analyses revealed that retrospective reports of how one was reared by parents and of how parents got along as husband and wife in one's family of origin reliably predicted changes in marriage from the last trimester of pregnancy through the time the baby was 9 months of age. Most significantly, results indicated that husband-wife differences in evaluations of marital adjustment increased over time when individuals recalled being reared in a cold-rejecting as opposed to warm-supportive manner, especially when individuals also recalled their own parents as not having an especially harmonious marital relationship. These findings are discussed in terms of potential processes by which experiences in one's family of origin may affect the way couples adjust to the birth and rearing of a new baby.  相似文献   

8.
In the last decade, a newmathematical microscope has allowed scientists and engineers to view the details of time varying and transient phenomena, in a manner hitherto not possible through conventionaltools. This invention, which goes by the name of wavelet transform, has created revolutionary changes in the areas of signal processing, image compression, not to speak about the basic sciences. This novel procedure enables one to achieve the so calledtime-frequency localization andmultiscale resolution, by suitably focussing and zooming around the neighborhood of one’s choice. Wavelets are of very recent origin; their construction, properties and applications are subjects of intense current research. In this article, we explain with illustrations the working of this transform and its advantages vis-a-vis the Fourier transform. In two companion articles, we describe the procedure to construct wavelet basis sets and their applications to data analysis and image compression.  相似文献   

9.
Business analytics courses, such as marketing research, data mining, forecasting, and advanced financial modeling, have substantial predictive modeling components. The predictive modeling in these courses requires students to estimate and test many linear regressions. As a result, false positive variable selection (type I errors) is nearly certain to occur. This article describes an in‐class demonstration that shows the frequency and impact of false positives on data mining regression‐based predictive modeling. In this demonstration, 500 randomly generated independent (X) variables are individually regressed against a single, randomly generated (Y) variable, and the resulting 500 p‐values are sorted and examined. This experiment is repeated and the distribution of the number of variables significant at the 5% level resulting from this simulation is presented and discussed. The demonstration provides a tangible example in which students see the reality and risks of incorrectly inferring statistical significance of independent regression variables. Students have expressed a deeper understanding and appreciation of the risks of type I errors through this demonstration. This demonstration is innovative because the scale of the simulation allows the students to experience the near certainty that the correlations shown in the results are truly random.  相似文献   

10.
This study examined trajectories of ethnic–racial identity (ERI) and autonomy development among Mexican‐origin adolescent females in the United States (N = 181; Mage at Wave 1 = 16.80 years, SD = 1.00) as they transitioned through the first 5 years of parenthood. Trajectories of ERI and autonomy also were examined in relation to psychosocial functioning. Unconditional latent growth models indicated significant growth in autonomy, ERI resolution, and ERI affirmation from middle to late adolescence. Conditional latent growth models indicated that autonomy and ERI exploration growth trajectories were positively associated with psychosocial adjustment. Although adolescent mothers are experiencing transitions that are not normative during adolescence, they also engage in normative developmental processes, and their engagement in such processes is linked with better adjustment.  相似文献   

11.
N S Leela 《Resonance》2003,8(8):43-47
As recently as 1994, the dinosaur of the plant kingdom, Wollemi pine (Wollemi nobilis) has been discovered in its site of origin, the Wollemi National Park, 150 km from the city of Sydney, Australia. This giant grows to a height of 40m with a trunk diameter of over 1m. All possible steps have been taken to conserve this giant in its own World Heritage Area. It is also being exploited to grow commercially to be released to the public by the year 2005. With increasing human interference on the environment, the rate of extinction of species is exceeding the rate of origin of new species. The tragedy is that many species including the giants of the living world might disappear even as efforts are on to discover yet-to-be identified species. NS Leela is a retired Professor and Head of the Department of Zoology, MES College, Bangalore, She is interested in popularising science through her writings in Kannada and English.  相似文献   

12.
  相似文献   

13.
Milk provides not only the building blocks for somatic development but also the hormonal signals that contribute to the biopsychological organization of the infant. Among mammals, glucocorticoids (GCs) in mother's milk have been associated with infant temperament. This study extended prior work to investigate rhesus monkey (Macaca mulatta) mother–infant dyads (N = 34) from birth through 8 months postpartum. Regression analysis revealed that cortisol concentrations in milk during the neonatal period predicted impulsivity on a cognitive task, but not global social behaviors, months later. During this time period, sex‐differentiated social behavior emerged. For female infants, milk cortisol concentrations predicted total frequency of play. Collectively, these findings support and extend the “lactational programming” hypothesis on the impact of maternal‐origin hormones ingested via milk.  相似文献   

14.
Racial origin and student retention in a Canadian University   总被引：1，自引：0，他引：1  
In the United States, research into the relationship between racial origin and university attrition has a relatively long history. In such research it has usually been found that particularly Black students and those of Hispanic origin have far lower retention rates than White students and those of Asian origin. In Canada, however, it has only been in recent years that large numbers of non-Whites from primarily British Commonwealth countries have immigrated to Canadian cities. As a result, there has been no investigation of race and student retention in Canadian universities.In this article, attention will focus on the first year voluntary and involuntary withdrawal of students of various racial origins enrolled full-time at York University, Canada's third largest university, located in Toronto. Students who withdraw involuntarily are those who because of low academic standing are debarred from continuing for a second year. Information for the study was obtained through end-of-year surveys carried out in 1993, 1994, and 1995 and from administrative records.In general it was found that differences in overall retention rates for Blacks and students of South Asian, Chinese, other non-European, and European origins are small. Moreover, a logistic regression analysis indicated that while racial origin is not a predictor of voluntary withdrawal from university at the end of first year, it has a slight effect on involuntary withdrawal.  相似文献   

15.
ABSTRACT

Difficulties suppressing previously encountered but currently irrelevant information from working memory characterize less skilled comprehenders in studies in which they are matched to skilled comprehenders on word decoding and nonverbal IQ. These “extreme” group designs are associated with several methodological issues. When sample size permits, regression approaches permit a more accurate estimation of effects. Using data for students in Grades 6 through 12 (n = 766), regression techniques assessed the significance and size of the relation of suppression to reading comprehension across the distribution of comprehension skill. After accounting for decoding efficiency and nonverbal IQ, suppression, measured by performance on a verbal proactive interference task, accounted for a small amount of significant unique variance in comprehension (less than 1%). A comparison of suppression in less skilled comprehenders matched to more skilled comprehenders (48 per group) on age, word reading efficiency, and nonverbal IQ did not show significant group differences in suppression. The implications of the findings for theories of reading comprehension and for informing comprehension assessment and intervention are discussed.  相似文献   

16.
分类回归树是一种优良的决策树算法,有广泛的应用。本文探讨了分类回归树算法及应用,首先回顾了分类回归树的起源及应用,其次分析了分类回归树在均匀成本和非均匀成本下的构造,接着讨论了分类回归树的剪枝和验证过程,最后我们对其进行了总结。  相似文献   

17.
Abstract

Capitalising on current research progress, we explored via means of structural equation modelling (SEM), the operational nature of three newly developed optimising concepts: personal resolve, effective functioning, and academic striving. We conceptualised self-efficacy as a source of origin, and effort expenditure and motivation towards learning as adaptive outcomes of the three mentioned concepts. Correlational responses from Taiwanese university students (N?=?1010) affirmed our hypothesis regarding the operational nature of personal resolve, effective functioning, and academic striving – for example – (i) self-efficacy as a source of origin of personal resolve, effective functioning, and academic striving, and (ii) the effects of personal resolve and academic striving on effort, and the effects of effective functioning and academic striving on motivation towards learning. This significant evidence, overall, contributes to the study of optimal achievement best.  相似文献   

18.
Selecting a subset of predictors from a pool of potential predictors continues to be a common problem encountered by applied researchers in education. Because of several limitations associated with stepwise variable selection procedures, the examination of all possible regression solutions has been recommended. The authors evaluated the use of Mallow's Cp and Wherry's adjusted R 2 statistics to select a final model from a pool of model solutions. Neither the Cp nor the adjusted R 2 statistic correctly identified the underlying regression model any better and was generally worse than the stepwise selection method, which itself was poor. Using any of the model selection procedures studied here resulted in biased estimates of the authentic regression coefficients and underestimation of their standard errors. The use of theory and professional judgment is recommended for the selection of variables in a prediction equation.  相似文献   

19.
中国城镇居民教育与收入代际流动的关系研究   总被引：1，自引：0，他引：1  
This study examines the relationship between education and intergenerational income mobility in urban China based on the data of Chinese Urban Household Education and Employment Survey (CHUHEES)—2004” by Institute of Economics of Education of Peking University. It analyzes the characteristics of the intergenerational income mobility of Chinese urban household through such indices as intergenerational income inheritance and mobility, and intergenerational income elasticity, exploring the role of education to promote intergenerational income mobility through pathanalysis and binary logistic regression. It also analyzes the changing tendency along with the progress of the market reform in China and tries to provide theoretical explanations for the empirical results. According to the findings, there is rather obvious intergenerational income transmission in urban China, and most children still resort in the same income group with their fathers. As a kind of important mechanism of intergenerational mobility, education is instrumental to promote children of disadvantage group to upgrade of their economic status, showing its strong functions to promote intergenerational upward mobility. With the improvement of the level of marketization together with appropriate social policy, the role of education to promote the intergenerational income mobility and social equity is getting stronger. __________ Translated from Jiaoyu Yanjiu 教育研究 (Educational Research), 2007, (5): 3–14  相似文献   

20.
Using dummy variables, this note offers a convenient illustration to demonstrate that regression can replace both the one‐factor analysis of variance and the two‐population t test with independent random samples. The exercise also helps to develop students’ intuition regarding regression coefficients.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号