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881.
Thomas K. Kenemore 《Child and Adolescent Social Work Journal》1999,16(4):257-257
882.
Thomas K. Kenemore 《Child and Adolescent Social Work Journal》2005,22(2):109-110
883.
Galit Shmueli Thomas P. Minka Joseph B. Kadane Sharad Borle Peter Boatwright 《Journal of the Royal Statistical Society. Series C, Applied statistics》2005,54(1):127-142
Summary. A useful discrete distribution (the Conway–Maxwell–Poisson distribution) is revived and its statistical and probabilistic properties are introduced and explored. This distribution is a two-parameter extension of the Poisson distribution that generalizes some well-known discrete distributions (Poisson, Bernoulli and geometric). It also leads to the generalization of distributions derived from these discrete distributions (i.e. the binomial and negative binomial distributions). We describe three methods for estimating the parameters of the Conway–Maxwell–Poisson distribution. The first is a fast simple weighted least squares method, which leads to estimates that are sufficiently accurate for practical purposes. The second method, using maximum likelihood, can be used to refine the initial estimates. This method requires iterations and is more computationally intensive. The third estimation method is Bayesian. Using the conjugate prior, the posterior density of the parameters of the Conway–Maxwell–Poisson distribution is easily computed. It is a flexible distribution that can account for overdispersion or underdispersion that is commonly encountered in count data. We also explore two sets of real world data demonstrating the flexibility and elegance of the Conway–Maxwell–Poisson distribution in fitting count data which do not seem to follow the Poisson distribution. 相似文献
884.
Certain recurrence relations for the single and product moments of the order statistics of a random sample of sizen arising from a beta distribution are derived. The usefulness of these relations in evaluating the single and product moments
of beta order statistics is also discussed. 相似文献
885.
Adam N. Glynn Jon Wakefield Mark S. Handcock Thomas S. Richardson 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2008,171(1):179-202
Summary. We illustrate that combining ecological data with subsample data in situations in which a linear model is appropriate provides two main benefits. First, by including the individual level subsample data, the biases that are associated with linear ecological inference can be eliminated. Second, available ecological data can be used to design optimal subsampling schemes that maximize information about parameters. We present an application of this methodology to the classic problem of estimating the effect of a college degree on wages, showing that small, optimally chosen subsamples can be combined with ecological data to generate precise estimates relative to a simple random subsample. 相似文献
886.
Brandon Whitcher Thomas C. M. Lee Jeffrey B. Weiss Timothy J. Hoar Douglas W. Nychka 《Journal of the Royal Statistical Society. Series C, Applied statistics》2008,57(3):293-312
Summary. The fundamental equations that model turbulent flow do not provide much insight into the size and shape of observed turbulent structures. We investigate the efficient and accurate representation of structures in two-dimensional turbulence by applying statistical models directly to the simulated vorticity field. Rather than extract the coherent portion of the image from the background variation, as in the classical signal-plus-noise model, we present a model for individual vortices using the non-decimated discrete wavelet transform. A template image, which is supplied by the user, provides the features to be extracted from the vorticity field. By transforming the vortex template into the wavelet domain, specific characteristics that are present in the template, such as size and symmetry, are broken down into components that are associated with spatial frequencies. Multivariate multiple linear regression is used to fit the vortex template to the vorticity field in the wavelet domain. Since all levels of the template decomposition may be used to model each level in the field decomposition, the resulting model need not be identical to the template. Application to a vortex census algorithm that records quantities of interest (such as size, peak amplitude and circulation) as the vorticity field evolves is given. The multiresolution census algorithm extracts coherent structures of all shapes and sizes in simulated vorticity fields and can reproduce known physical scaling laws when processing a set of vorticity fields that evolve over time. 相似文献
887.
The Tukey lambda family of distributions together with its extensions have played an important role in statistical practice. In this paper a con¬tinuously defined two-parameter generalization of this family, which holds promise of a variety of additional applications, is variously studied. The coefficients of skewness and kurtosis and the density shapes of its members are examined and the family is related to the classical Pearsonian system of distributions. 相似文献
888.
889.
This paper conceptualizes and estimates a model of welfare participation that tests for community effects. Theoretically, the model is consistent with Fischer's (1984) notion of urban life, and a welfare participation model developed by Rank and Hirschl (1993). The empirical analysis includes aggregate and multivariate tests, and an identification of these effects in terms of household knowledge and behavior. We find strong evidence that community structure influences the decision to get food stamps, and one notable difference with the Rank and Hirschl findings: community poverty level is a more powerful and global predictor of participation than is population density. The findings suggest emendations to Wilson's notion of the truly disadvantaged insofar as residence in high poverty areas afford opportunities for information exchange and the development of specialized networks. 相似文献
890.