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101.
This paper explores the effect of sample size, scale of parameters and size of the choice set on the maximum likelihood estimator of the parameters of the multinomial logit model. Data were generated by simulations under a three-way factorial experimental design for logit models containing three, four and five explanatory variables. Simulation data were analyzed by analysis of covariance and a regression model of the performance measure, the log root mean-squared error (LRMSE), fitted against the three factors and their interactions. Several important conclusions emerged. First, the LRMSE improves, but at a decreasing rate, with increases in the model's degrees of freedom. Second, the number of choice alternatives in the decision makers' choice sets has a significant impact on the LRMSE; however, heterogeneity in the choice sets across the sample has little or no impact. Finally, the scale of parameters and all of its two-way interactions with the other two factors significantly affect the LRMSE. Using the regression results, a family of iso-LRMSE curves are derived in the space of model degrees of freedom and scale of parameters. Their implications for researchers in choosing sample size and scale of parameters is discussed. 相似文献
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Charles H. Anderson 《Sociological inquiry》1969,39(1):77-83
The question of social and psychological separation of the academic and intellectual in American society is raised. The empirical literature, although in short supply, suggests that the academic is socially isolated from the larger society and experiences attitudinal alienation. Interviews with sixty-one college and university professors tended to confirm this view, but particularly so among those respondents who identified themselves as intellectuals. 相似文献
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A consistent, Markovian family of conditional densities is constructed which is not compatible with any random field. 相似文献
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Since its inception, the concept of absorptive capacity has been closely linked with notions of organizational learning. Yet the precise nature of the relationship between these two concepts has never been established. This relationship is examined in a variety of ways, and it is suggested that the literature on these two concepts shares a conceptual affinity which needs to be delineated. It is suggested that absorptive capacity (a dynamic capability) is a concrete example of organizational learning that concerns an organization's relationship with new external knowledge. Using the 4I Model for organizational learning ( Crossan, M.M., Lane, H.W. and White, R.E. (1999 ). An organizational learning framework: from intuition to institution. Academy of Management Review, 24, 522–537) and Zahra and George's conceptualization of absorptive capacity ( Zahra, S.A. and George, G. (2002 ). Absorptive capacity: a review, reconceptualization, and extension. Academy of Management Review, 27, 185–203), this paper proposes an integration of the two concepts. 相似文献
110.
Anderson SG 《Child welfare》2006,85(4):715-736
Based on a survey of public assistance and child welfare agency staff, this article examines how state Temporary Assistance for Needy Families (TANF) policy decisions have affected kinship care providers. Findings indicate that most states have continued using TANF to provide income support to kinship caregivers, and some have used TANF to find related support services. These payments, however, are much lower than rates for licensed providers, and many kinship caregivers are subject to work, training requirements, and time limits. 相似文献