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61.
This study examines how age and gender influence the ability of social process theory to explain adolescent cigarette use. Differences in the causal effects of social process variables for three age periods for male and female adolescents are examined. Longitudinal data from a sample of midwestern adolescents are analyzed using path analyses procedures. Findings from these analyses indicate that social process theory is better able to account for cigarette use among older females than any other age and gender group. For females, commitment to education and school activities were better predictors of cigarette smoking at a later age than an earlier age, whereas the opposite was found for belief in conventional societal rules. For males, previous smoking was the major variable in all three age groups to directly affect subsequent smoking. These findings are discussed in terms of previous age and gender research. 相似文献
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Marvin Lentner 《统计学通讯:模拟与计算》2013,42(4):149-154
Various approximate procedures have been employed in the tabulation of F distributions. These approximations generally perform poorly for small degrees of freedom and/or for extreme tail areas. Closed form expressions are presented in this paper for the exact calculation of cumulative probabilities of F distributions. For small degrees of freedom, the probabilities may be calculated with the aid of standard mathematical tables and a calculator. An APL computer program, also presented in this paper, may be used in calculating the cumulative probabilities according to the exact expressions. 相似文献
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Desire for flexibility suggests that the value of a choice-menu should increase with the number of options included. Complexity-aversion
on the other hand may imply that the value of a menu decreases with its cardinality. We present the results of an experiment
where 5 groups of subjects were asked to evaluate saving plans that let the investor choose between alternative indexing-schemes
before the saving period ends. The complexity of the different plans was manipulated in two ways: (1) increasing the number
of indexing options; (2) reducing the quality of information upon which the choice between different indices is made. We show
that an increase in the number of indexing-options produces a negative complexity effect when the quality of information is
high. The same change however results in a positive flexibility effect when the quality of information is low. More generally
our results suggest a `negative cross interaction of complexity effects' and that the impact of complexity is marginally decreasing.
We discuss possible cognitive explanations to the observed evaluation-patterns.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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A warehouses location problem is treated using a mixed integer programming and a heuristic algorithm. A simplification of freight rates schedules, based upon shipments consolidation and a linear regression of rates vs distances was made. Warehousing costs were divided according to fixed and variable and related to the throughput of the warehouses. Consideration was given in the analysis to the choice between owning and leasing each warehouse. In the case studied, the analysis demonstrated that a possible saving of approximately 22 per cent in annual distribution costs could be realized under the optimized warehouse location network. 相似文献
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Community Context and Theories of Deviant Behavior: An Examination of Social Learning and Social Bonding Theories 总被引:1,自引:0,他引:1
The social learning and social bonding theories of deviant behavior were investigated in four community contexts: farm, rural-nonfarm, suburban, and urban. The mean differences across these contexts on pertinant variables did not form a continuum from rural to urban. Rather, the farm and suburban areas were similar, and the rural-nonfarm and urban areas were more alike than either of the other two contexts. A number of the social bonding variables interacted with community context, but no systematic pattern was observed. Social learning variables did not interact with context. Rather, the different level of these variables appeared to account for the variance in deviant behavior. 相似文献