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171.
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Traditional new product diffusion models have assumed a constant market potential over the planning horizon for forecasting product adoptions. This assumption is conceptually unsound and is likely to yield either theoretically unacceptable parameter estimates of the model or poor demand forecasts. This paper presents a dynamic growth model which relaxes this assumption. Model illustrations, limitations and further extensions are included. 相似文献
173.
Exploring Gender Differences on Internalizing and Externalizing Behavior Among Maltreated Youth: Implications for Social Work Action 总被引:1,自引:0,他引:1
Tina Maschi Keith Morgen Carolyn Bradley Schnavia Smith Hatcher 《Child and Adolescent Social Work Journal》2008,25(6):531-547
This purpose of this study was to explore the moderating influence of gender on the relationship between child maltreatment
and internalizing symptoms (e.g., affective and somatic problems) and externalizing behavior (e.g., rule breaking behavior
and aggression) among children aged 7–12 years old. Using a longitudinal comparison group design and a sample of 300 youth
of which 56% (n = 168) had substantiated cases of child maltreatment, results of a structural equation modeling revealed that internalizing
symptoms exerted a mediating influence that was conditioned by gender. Only girls’ internalizing symptoms were found to mediate
the link between child maltreatment and externalizing behavior while a direct relationship between maltreatment and externalizing
behavior was found among boys. These findings provide evidence for gender differences in the pathways between being child
maltreatment and maladaptive thoughts, feelings, and behaviors. Thus, adapting evidence-based strategies that target gender
specific internalizing behaviors and externalizing behaviors among maltreated youth may significantly reduce the risk of short
and long-term maladaptive behavior. 相似文献
174.
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176.
James P. Sampson Gary W. Peterson Robert C. Reardon Janet G. Lenz 《The Career development quarterly》2000,49(2):179-185
This article responds to D. A. Jepsen's (2000) commentary on Sampson et al.'s theory‐based approach to using readiness assessment to improve career services (J. P. Sampson, G. W. Peterson, R. C. Reardon, & J. G. Lenz, 2000). Three topics are included in this response: the reliability, validity, and utility of readiness assessment measures; verbal ability and the use of cognitive information‐processing theory in practice; and the potential contribution of reflective evaluation in career decision making. This article concludes with recommended research questions to examine the impact of readiness assessment on the effectiveness of career service delivery. 相似文献
177.
The authors review log‐linear models for estimating the size of a closed population and propose a new log‐linear estimator for experiments having between animal heterogeneity and a behavioral response. They give a general formula for evaluating the asymptotic biases of estimators of abundance derived from log‐linear models. They propose simple frequency modifications for reducing these asymptotic biases and investigate the modifications in a Monte Carlo experiment which reveals that they reduce both the bias and the mean squared error of abundance estimators. 相似文献
178.
The Social Cognitions of Socially Withdrawn Children 总被引:2,自引:0,他引:2
The purpose of this study was to examine the social cognitions of peer‐identified socially withdrawn children. Participants included 457 children from grades four, five and six (54% females, 46% males). Children completed a selection of self‐ and peer‐report measures including: (1) peer‐rated behavioral nominations; (2) hostile intent biases and social responses to ambiguous situations; (3) social goals and self‐efficacy; and (4) a newly developed measure of causal attributions. An extreme groups procedure was used to identify three groups of children: (1) socially withdrawn (n=50); (2) aggressive (n=53); and (3) a comparison group (n=206). As compared with their peers, withdrawn children displayed a pattern of self‐defeating attributions for social situations, reported lower efficacy for assertive goals, and indicated a preference for non‐assertive, withdrawn strategies to deal with hypothetical conflict situations. Findings are discussed with respect to implications for interventions, and directions for further research are presented. 相似文献
179.
Dr. Maria Scannapieco Ph.D. Judith Schagrin L.C.S.W. Tina Scannapieco 《Child and Adolescent Social Work Journal》1995,12(5):381-389
Children are entering foster care at an alarming rate. There were an estimated 429,000 children in out-of-home care at the end of 1991, which is a 64% increases since 1982 (Tatara, 1990). The largest proportion of children in out-of-home care are between the ages of 13 and 18 (Mech, 1988; Tatara, 1989). Each year, an estimated 16,000 (Sims, 1988) to 18,000 (Ryan, McFadden, Rice, & Warren, 1988) youth are emancipated and leave foster care to assume independence. Many of these young adults are not prepared for self-sufficiency (Barth, 1986, 1990; Festinger, 1983; Westat, 1988). Adolescents from varying out-of-home care settings are eligible for a set of services—Independent Living Programs.The findings of this study suggest that Independent Living Programs may have positive impact on the ability of youth to be self-sufficient at the time of discharge from foster care programs. The youth who participated in the ILP program were more likely to complete high school, have employment history and employment at discharge, and were more likely to be self supporting at the closing of the case.and Ms. Scannapieco is a research assistant, Temple University Center for Human Development and Education. 相似文献
180.
Debra S. Osborn Gary W. Peterson James P. Sampson Robert C. Reardon 《The Career development quarterly》2003,51(4):356-367
Although existing literature suggests that client anticipations affect career counseling, previous studies have not systematically assessed client anticipations prior to using computer‐assisted career guidance (CACG) systems in career counseling. This study describes how 55 clients from a career center at a large, southeastern university anticipated using CACG systems to help in their career decision making and problem solving. Using a Cognitive Information Processing framework, responses to a cued and a free response survey indicated that clients' most frequent anticipations included increased career options, enhanced self‐knowledge, and strengthened occupational knowledge. 相似文献