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Contemporary theories on leadership development emphasize the importance of having a leader identity in building leadership skills and functioning effectively as leaders. We build on this approach by unpacking the role leader identity plays in the leader emergence process. Taking the perspective that leadership is a dynamic social process between group members, we propose a social network-based process model whereby leader role identity predicts network centrality (i.e., betweenness and indegree), which then contributes to leader emergence. We test our model using a sample of 88 cadets participating in a leadership development training course. In support of our model, cadets who possess a stronger leader role identity at the beginning of the course were more likely to emerge as leaders. However this relationship was only mediated by one form of network centrality, indegree centrality, reflecting one's ability to build relationships within one's group. Implications for research and practice are discussed. 相似文献
23.
David J. Sharrow Jessica Godwin Yanjun He Samuel J. Clark Adrian E. Raftery 《Population studies》2018,72(1):1-15
In 2015, the United Nations (UN) issued probabilistic population projections for all countries up to 2100, by simulating future levels of total fertility and life expectancy and combining the results using a standard cohort component projection method. For the 40 countries with generalized HIV/AIDS epidemics, the mortality projections used the Spectrum/Estimation and Projection Package (EPP) model, a complex, multistate model designed for short-term projections of policy-relevant quantities for the epidemic. We propose a simpler approach that is more compatible with existing UN projection methods for other countries. Changes in life expectancy are projected probabilistically using a simple time series regression and then converted to age- and sex-specific mortality rates using model life tables designed for countries with HIV/AIDS epidemics. These are then input to the cohort component method, as for other countries. The method performed well in an out-of-sample cross-validation experiment. It gives similar short-run projections to Spectrum/EPP, while being simpler and avoiding multistate modelling. 相似文献
24.
Sascha O. Becker Samuel Bentolila Ana Fernandes Andrea Ichino 《Journal of population economics》2010,23(3):1047-1071
We test whether job insecurity of parents and children affect children’s moving-out decisions. Macroeconomic estimates for
13 European countries over 1983–2004 show that coresidence increases by 1.7 percentage points (PP) following a 10 PP rise
in the share of youths perceiving their job to be insecure and declines by 1.1 PP following the same increment in insecurity
for older workers. Microeconometric evidence for Italy in the mid-1990s shows that the probability of moving out increases
by about half a percentage point for a one-standard-deviation increase in paternal insecurity and by one-third of a percentage
point for a one-standard-deviation decrease in children’s insecurity. 相似文献
25.
Siobhan A. Morse MHSA CRC CAI MAC Samuel MacMaster PhD 《Journal of social work practice in the addictions》2014,14(1):6-26
Substance use among college-age adults is of interest due to high levels of use and low levels of treatment access and engagement relative to other adults. Data collected from 1,972 clients in residential services were analyzed to investigate differences in use patterns, treatment outcomes, and other life area problems. Participants completed an Addiction Severity Index (ASI) and the University of Rhode Island Change Assessment (URICA) at baseline, and an ASI and Treatment Services Review at 1-month and 6-month postdischarge interviews. Almost a quarter (24.1%) of participants were college age (18–25 years old). They were more likely to be White and male, and less likely to complete treatment although they had a longer average length of stay. College-age adults improved on all outcome measures, and posttreatment service use shows significant difference between college-age and older participants. Implications for practice are discussed. 相似文献
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Does Viewing Pornography Diminish Religiosity Over Time? Evidence From Two-Wave Panel Data 总被引:1,自引:1,他引:0
Samuel L. Perry 《Journal of sex research》2017,54(2):214-226
Research consistently shows a negative association between religiosity and viewing pornography. While scholars typically assume that greater religiosity leads to less frequent pornography use, none have empirically examined whether the reverse could be true: that greater pornography use may lead to lower levels of religiosity over time. I tested for this possibility using two waves of the nationally representative Portraits of American Life Study (PALS). Persons who viewed pornography at all at Wave 1 reported more religious doubt, lower religious salience, and lower prayer frequency at Wave 2 compared to those who never viewed porn. Considering the effect of porn-viewing frequency, viewing porn more often at Wave 1 corresponded to increases in religious doubt and declining religious salience at Wave 2. However, the effect of earlier pornography use on later religious service attendance and prayer was curvilinear: Religious service attendance and prayer decline to a point and then increase at higher levels of pornography viewing. Testing for interactions revealed that all effects appear to hold regardless of gender. Findings suggest that viewing pornography may lead to declines in some dimensions of religiosity but at more extreme levels may actually stimulate, or at least be conducive to, greater religiosity along other dimensions. 相似文献
28.
Jenny K. Rinehart Erica E. Nason Elizabeth A. Yeater Geoffrey F. Miller 《Journal of sex research》2017,54(3):273-283
Institutional review boards (IRBs) have expressed concerns that certain individuals or groups, such as participants who are younger, ethnic minorities, or who have certain psychological or personality traits, may be particularly distressed when participating in “sensitive topics” research. This study examined the effects of several demographic and individual difference factors (i.e., age, sex, ethnicity, religiosity, Big Five personality traits, and baseline psychological distress levels) on reactions to participation in sensitive topics research. Participants were 504 undergraduates who completed an extensive battery of either trauma/sex questionnaires or cognitive tests and rated their positive and negative emotional reactions and the perceived benefits and mental costs of participating. They also compared research participation to normal life stressors. Our findings indicated that individual difference and demographic risk factors do not increase participant distress after participating in sex/trauma research over and above that experienced after participating in traditionally minimal-risk cognitive tasks. Participants generally found research participation less distressing than normal life stressors and even enjoyable. 相似文献
29.
Holning Lau Geoffrey Yeung Rebecca L. Stotzer Charles Q. Lau Kelley Loper 《Journal of homosexuality》2017,64(4):509-522
Tongzhi is one of several Chinese terms that refer to individuals who are attracted to the same sex. Using data from two different surveys in Hong Kong, this research note examines how the term tongzhi coexists with other terms. We investigate the prevalence of self-identification as tongzhi, and we explore the extent to which using the term tongzhi influences public attitudes toward gay people and gay rights. Activists began popularizing the term tongzhi in the late 1980s, but less than one third of the participants in our 2008 survey of sexual orientation minorities (n = 728) described themselves as tongzhi. Using a split-ballot experiment in a 2013 public opinion poll (n = 831), we found that attitudes toward gay people and gay rights were not significantly impacted by whether questions were phrased in terms of tongzhi or the main alternative term tongxinglianzhe. We discuss how our findings can enrich understandings of earlier research and illuminate avenues for future study. 相似文献
30.
Chodziwadziwa W. Kabudula Brian Houle Mark A. Collinson Kathleen Kahn Stephen Tollman Samuel Clark 《Social indicators research》2017,133(3):1047-1073
Understanding the distribution of socioeconomic status (SES) and its temporal dynamics within a population is critical to ensure that policies and interventions adequately and equitably contribute to the well-being and life chances of all individuals. This study assesses the dynamics of SES in a typical rural South African setting over the period 2001–2013 using data on household assets from the Agincourt Health and Demographic Surveillance System. Three SES indices, an absolute index, principal component analysis index and multiple correspondence analysis index, are constructed from the household asset indicators. Relative distribution methods are then applied to the indices to assess changes over time in the distribution of SES with special focus on location and shape shifts. Results show that the proportion of households that own assets associated with greater modern wealth has substantially increased over time. In addition, relative distributions in all three indices show that the median SES index value has shifted up and the distribution has become less polarized and is converging towards the middle. However, the convergence is larger from the upper tail than from the lower tail, which suggests that the improvement in SES has been slower for poorer households. The results also show persistent ethnic differences in SES with households of former Mozambican refugees being at a disadvantage. From a methodological perspective, the study findings demonstrate the comparability of the easy-to-compute absolute index to other SES indices constructed using more advanced statistical techniques in assessing household SES. 相似文献