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251.
A modified transformed chi-square statistic is defined for testing hypotheses of quasi-independence in the incomplete multi-dimensional contingency table and a simple method for determining degrees of freedom is given. A modified transformed chi-squareestimator of the expected cell frequencies is given in closed form for a general class of exact linear constraints. The co-variance matrix of estimated cell frequencies is derived under the assumption of a conditional Poisson distribution. 相似文献
252.
Samuel Y Dennis III 《统计学通讯:理论与方法》2013,42(7):1895-1913
This paper concerns an inquiry into the problem of generating closed form expressions for the cumulative distribution and probability density functions of products of independent beta variates. Recursive analytical procedures for constructing the equational forms of these functions-from their Mellin inversion integral representations, via the Cauchy residue theorem-are described. A numerical example illustrating details of the construction of a computable form of the distribution function of the product of three independent beta variates is also included. 相似文献
253.
Consider a one-way layout of the analysis of variance assuming independence, normality, and homogeneity of variance. Test the null hypothesis Ho that the means, j., of each of Amp; columns, i = 1,…, k are equal versus the alternative that they follow an umbrella pattern. That is, the alternative is H1-H0 where H1: μ1> μ2>… > μk, and m is known. We derive a class of tests which are unbiased and lie in a nontrivial complete class. We recommend specific tests within the class. A simulation of the power functions of some tests is contrasted with the simulated power function of the likelihood ratio test. 相似文献
254.
Kenneth E. Vail III Jamie Arndt Matt Motyl Tom Pyszczynski 《Analyses of Social Issues and Public Policy》2009,9(1):255-268
In line with terror management theory, this research demonstrates that mortality salience motivated increased support for John McCain in the absence of reminders of compassionate values. However, polls had indicated that Barack Obama was generally perceived as the more compassionate of the two candidates. Thus, when compassionate values were made salient, death reminders motivated participants to uphold these values by significantly increasing their support for the more compassionate Barack Obama instead. The implications of these findings for terror management theory, the 2008 presidential election, and political endorsements are discussed . 相似文献
255.
Qinyi Zhang Sarah Filippi Arthur Gretton Dino Sejdinovic 《Statistics and Computing》2018,28(1):113-130
Representations of probability measures in reproducing kernel Hilbert spaces provide a flexible framework for fully nonparametric hypothesis tests of independence, which can capture any type of departure from independence, including nonlinear associations and multivariate interactions. However, these approaches come with an at least quadratic computational cost in the number of observations, which can be prohibitive in many applications. Arguably, it is exactly in such large-scale datasets that capturing any type of dependence is of interest, so striking a favourable trade-off between computational efficiency and test performance for kernel independence tests would have a direct impact on their applicability in practice. In this contribution, we provide an extensive study of the use of large-scale kernel approximations in the context of independence testing, contrasting block-based, Nyström and random Fourier feature approaches. Through a variety of synthetic data experiments, it is demonstrated that our large-scale methods give comparable performance with existing methods while using significantly less computation time and memory. 相似文献
256.
Arthur E. Attema Han Bleichrodt Olivier L’Haridon Patrick Peretti-Watel Valérie Seror 《Journal of Risk and Uncertainty》2018,56(2):117-140
This study compares discounting for money and health in a field study. We applied the direct method, which measures discounting independent of utility, in a representative French sample, interviewed at home by professional interviewers. We found more discounting for money than for health. The median discount rates (6.5% for money and 2.2% for health) were close to market interest rates, suggesting that at the aggregate level the direct method solves the puzzle of unrealistically high discount rates typically observed in applied economics. Constant discounting fitted the data better than the hyperbolic discounting models that we considered. The substantial individual heterogeneity in discounting was correlated with age and occupation. 相似文献
257.
We present a combinatorial proof of two fundamental composition identities associated with Chebyshev polynomials. Namely, for all m,n?0, Tm(Tn(x))=Tmn(x) and Um−1(Tn(x))Un−1(x)=Umn−1(x). 相似文献
258.
259.
Residential lawns provide chronosequences to examine influences of home age and aboveground tree biomass (ATB) on soil carbon (C) levels. Soil C dynamics were compared between 44 lawns with trees (LwT) and 23 without trees (PL). At the 0–15 cm depth, LwT had higher mean soil C than PL and an earlier rise in median soil C across home age. Nonparametric quantile regression also showed a steeper rise in the 5th, 50th, and 95th soil C quantiles for LwT. Fitted polynomial regression models indicated that home age and ATB together accounted for 40 % of the soil C variation at the 0–15 cm depth [C = 1.34 + 0.05(Age) + 0.0003(ATB)]. At the 15–30 cm depth, the interaction between home age and ATB explained 33 % of the soil C variation [C = 0.78 + 0.0003(Age*ATB)]; at 30–50 cm, ATB was responsible for 20 % [C = 0.56 + 0.0003(ATB)]. 相似文献
260.
The professional practice of marriage and family therapy (MFT) scholarship is regulated at the master’s level in the United States. Consequently, contemporary curricular issues have largely been focused on what is to be achieved within the master’s degree, with an emphasis on clinical practice. We consider here what value may and should be added through the doctoral degree in marriage and family therapy. Doctoral programs are the developmental stage wherein we should seek to transmit the specialized knowledge and skills germane to MFT scholarship and practice in diverse settings, e.g., clinical and research intensive university, family law, health care, child development and education, child welfare, juvenile justice, faith based, and business. However, underlying this specialty education are three transcendental goals: sophistication of family systems scholarship, socialization into the profession of MFT, and cultivation of professional maturity. 相似文献