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Artificial neural networks are new methods for classification. We investigate two important issues in building neural network models; network architecture and size of training samples. Experiments were designed and carried out on two-group classification problems to find answers to these model building questions. The first experiment deals with selection of architecture and sample size for different classification problems. Results show that choice of architecture and choice of sample size depend on the objective: to maximize the classification rate of training samples, or to maximize the generalizability of neural networks. The second experiment compares neural network models with classical models such as linear discriminant analysis and quadratic discriminant analysis, and nonparametric methods such as k-nearest-neighbor and linear programming. Results show that neural networks are comparable to, if not better than, these other methods in terms of classification rates in the training samples but not in the test samples. 相似文献
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Abstract. The paper deals with present, demographically-based problems in highly-developed labour markets, with special reference to the Belgian and Dutch experience. Both sluggish inflow by young cohorts and early retirement by senior workers are analysed. The first of these phenomena can be explained by the falling birth rate and increasing educational levels; the second phenomenon is the result of technological changes in the labour market and a social security system which offers attractive opportunities for early outflow. For companies, this trend translates into a loss of experience and a loss of corporate culture. On top of this, the social security system is coming under heavy pressure and scarcity symptoms are likely to develop on the supply side of the labour market. 相似文献
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ABSTRACTWith the rapid growth in incarceration in the United States over the past few decades came dramatic growth in the number of the incarcerated parents with at least one minor child. Parental incarceration places extra stresses and strains on families and children. Almost all of those incarcerated will eventually be released. However, the majority of those released from prison will be rearrested within a year. Finding interventions that can decrease the likelihood of returning to crime and to incarceration are of utmost importance. Using a social bond theory framework, the authors examine the moderating effect of living with a child before incarceration on program outcomes related to a prison-based parent management training program. A significant effect was found. Implications for these findings are discussed for future research and practice. 相似文献
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Keva M. Miller J. Mark Eddy Sharon Borja Sarah R. Lazzari 《Smith College studies in social work》2017,87(1):59-77
ABSTRACTIncarcerated parents have complex life histories that often remain unresolved during incarceration, can continue to create barriers to prosocial success on release, and present similar intergenerational challenges for their children. This study examines the life histories of incarcerated fathers and mothers from the Pacific Northwest and how their experiences vary based on race and ethnicity. Five areas examined were exposure to trauma, child welfare involvement, mental health and substance abuse problems, juvenile justice and adult criminal justice involvement, and intergenerational criminal justice involvement. The sample comprised 359 incarcerated parents, and their racial/ethnic composition was 59% White, 14% African American, 11% multiracial, 8% Native American, and 7% Latino. Few differences were found across racial and ethnic groups. Mothers appeared more similar to each other across groups than fathers. Results illustrated similarities yet some surprising differences with national trends on key study variables. Implications for future research and intervention and prevention are discussed. 相似文献
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Family comes first or open all hours?: How low paid women working in food retailing manage webs of obligation at home and work 总被引:1,自引:0,他引:1
Kathryn Backett-Milburn Laura Airey Linda McKie Gillian Hogg 《The Sociological review》2008,56(3):474-496
This paper draws on qualitative findings from a study exploring work-life balance issues amongst female employees within food retailing. Whilst female employment is fundamental to this sector, there is limited evidence on employees' experiences of reconciling relatively low-paid work and the particular demands of food retailing with domestic and caring responsibilities. Managing competing discourses and demands at home and work is a feature of many women's lives. For those in low-paid jobs, with fewer material resources to fall back on, such webs of obligation, often stretching over the lifecourse, may be particularly difficult to navigate or escape. In food retail work, as in caring/domestic emergencies, timeframes may be tight and demands made on workers at short notice and outwith the standard working day. The study showed that sustaining their moral identities both as good mothers/daughters/family members ('family comes first') and as good and reliable workers ('the store must be staffed') was, therefore, an everyday practical accomplishment for these food retail employees. We explore women's accounts against the backdrop of particular familial, workplace and socio-cultural expectations and constraints, identifying overlapping sets of values between home and work as well as points of contradiction and tension. 相似文献
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Robert V Hogg 《统计学通讯:理论与方法》2013,42(22):2531-2542
k?i=1 Tl Tk 相似文献
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Some properties of trimmed and outer means for the normal situation are considered; in particular, the mean of the outer half of the sample has the same variance as the mean of the inner half. An inequality involving variances of unbiased estimators of location and their complements is derived and some of its consequences are examined. 相似文献
10.
Andrea Reupert Kim Foster Darryl Maybery Kylie Eddy Elizabeth Fudge 《Child & Family Social Work》2011,16(2):192-200
This study outlines pilot evaluation data of the web‐based training resource ‘Keeping Families and Children in Mind’, designed for clinicians who work with families where a parent has a mental illness. The resource was developed from scoping existing workforce packages and in consultation with consumers, carers, researchers and mental‐health clinicians. Preliminary evaluation data were collected from an urban and a rural site in Australia via focus group interviews and pre‐ and post‐training questionnaires to ascertain the experiences of those who participated in the training. Additionally, training facilitators were invited to maintain journals in order to identify planning and implementation issues when using the resource. Post‐training, participants emphasized the need to work collaboratively with others, as well as the importance of acknowledging and working with the family members of consumers, especially children. Also, participants reported positive changes in knowledge, skill and confidence when working with families affected by parental mental illness. Facilitators highlighted technology issues and the need to work interactively with participants when using the resource. Recommendations regarding policy and future research conclude this paper. 相似文献