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241.
Norman E. Breslow & Richard Holubkov 《Journal of the Royal Statistical Society. Series B, Statistical methodology》1997,59(2):447-461
Outcome-dependent sampling increases the efficiency of studies of rare outcomes, examples being case—control studies in epidemiology and choice–based sampling in econometrics. Two-phase or double sampling is a standard technique for drawing efficient stratified samples. We develop maximum likelihood estimation of logistic regression coefficients for a hybrid two-phase, outcome–dependent sampling design. An algorithm is given for determining the estimates by repeated fitting of ordinary logistic regression models. Simulation results demonstrate the efficiency loss associated with alternative pseudolikelihood and weighted likelihood methods for certain data configurations. These results provide an efficient solution to the measurement error problem with validation sampling based on a discrete surrogate. 相似文献
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243.
Norman K. Denzin 《The Sociological quarterly》1996,37(4):743-752
244.
Marc A. Scott Robert G. Norman Kenneth I. Berger 《Journal of the Royal Statistical Society. Series C, Applied statistics》2004,53(3):507-521
Summary. Longitudinal modelling of lung function in Duchenne's muscular dystrophy is complicated by a mixture of both growth and decline in lung function within each subject, an unknown point of separation between these phases and significant heterogeneity between individual trajectories. Linear mixed effects models can be used, assuming a single changepoint for all cases; however, this assumption may be incorrect. The paper describes an extension of linear mixed effects modelling in which random changepoints are integrated into the model as parameters and estimated by using a stochastic EM algorithm. We find that use of this 'mixture modelling' approach improves the fit significantly. 相似文献
245.
Michael Norman, head of serials cataloging at University of Illinois at Urbana-Champaign (UIUC) library, describes his library's development of an integrated management system for serials, the Online Research Resources (ORR). The ORR was designed to draw together and deliver to the public a wide range of information related to the library's serial holdings that previously could only be obtained by consulting a number of sources. With a single search, UIUC patrons can now consult the ORR for serials information such as variant titles, online availability, subject categories, print summary statements, ISI impact factor, where the title is indexed, and whether it is peer reviewed—an innovation sorely needed and highly welcomed by librarians and patrons alike. 相似文献
246.
This paper is concerned with estimating the parameters of Tadikamalla-Johnson's LUdistributions based on the method of moments. Tables of the parameters of the LU distribution are given for selected values of skewness (0.0(0.05) 1.0(0.1)2.0) and for twenty values of kurtosis at intervals of 0.2. The construction and use of these tables is explained with a numerical example. 相似文献
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Norman K. Denzin 《Symbolic Interaction》2007,30(4):447-461
Presented to the Society for the Study of Symbolic Interaction in Montreal, Canada, on August 7, 2006, this performance text is a critique of the Bush administration and its reliance on science, or evidence‐based models of inquiry (SBR). SBR raises issues concerning the politics of truth and evidence. These issues intersect with the ways in which a given political regime fixes facts to fit ideology. Three versions of SBR are discussed. A model of science as disruptive cultural practice is outlined. I locate the interactionist project in the discourses surrounding the global war on terror and the war in Iraq. I conclude by calling for a merger of critical pedagogy with a prophetic, feminist postpragmatism. 相似文献
250.
The usefulness of an extra sum of squares statistics QK for detecting K outliers has been discussed previously in the context of two-way tables. (See Gentleman and Wilk, 1975a, 1975b; John and Draper 1978; and Draper and John, 1980,) That work is extended here to straight line regression situations arising from, and motivated by, a specific set of research data. Percentage points for the appropriate test statistics are obtained by simulation, and approximations for these percentage points are suggested. Power calculations made for various designs and outlier situations are briefly summarized. 相似文献