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31.
Jorge Olguín & Tom Fearn 《Journal of the Royal Statistical Society. Series C, Applied statistics》1997,46(4):449-462
The visual inspection of a half-normal plot is a popular procedure for interpreting data from unreplicated factorial experiments. As this technique is somewhat subjective, the plot should preferably be supplemented with a more formal procedure. However, despite the improvements proposed by Zahn, the formal method using the half-normal plot suggested by Daniel seems to be rarely used. We investigate this procedure by using simulations and real data and suggest a modification to improve its acceptability. We also present corrected critical values for a procedure proposed by Lenth which was found to be miscalibrated. 相似文献
32.
Jorge M. Arevalillo 《统计学通讯:理论与方法》2013,42(11):3196-3205
ABSTRACTThis article is concerned with the derivation and study of the Cornish-Fisher expansion for a wide class of estimators of the parameter in the first order autoregressive process. Second and third order Cornish-Fisher approximations to the quantile of the distribution of the corresponding asymptotically normal standardized statistic are stated explicitly and their accuracy is examined, both theoretically and numerically, by comparing them with the exact value of the quantile obtained by Monte Carlo simulation. 相似文献
33.
The study of the dependence between two medical diagnostic tests is an important issue in health research since it can modify the diagnosis and, therefore, the decision regarding a therapeutic treatment for an individual. In many practical situations, the diagnostic procedure includes the use of two tests, with outcomes on a continuous scale. For final classification, usually there is an additional “gold standard” or reference test. Considering binary test responses, we usually assume independence between tests or a joint binary structure for dependence. In this article, we introduce a simulation study assuming two dependent dichotomized tests using two copula function dependence structures in the presence or absence of verification bias. We compare the test parameter estimators obtained under copula structure dependence with those obtained assuming binary dependence or assuming independent tests. 相似文献
34.
The distributions of coherent systems with components with exchangeable lifetimes can be represented as mixtures of distributions of order statistics (k-out-of-n systems) from possibly dependent samples by using the concept of the signature of Samaniego (1985). This representation, together with Rychlik's (1993) results, can be used to obtain sharp bounds on the distribution (or the reliability) function and on the expected lifetime of the system. Also, this representation can be used to determine the asymptotic behavior of the hazard rate of the system when the order statistics are ordered in the hazard rate order. Moreover, the lifetime distributions of coherent systems (and in particular, of order statistics) can also be represented as generalized mixtures (that is, mixtures with some negative weights) of distributions of series system lifetimes by using the concept of the minimal signature defined by Navarro et al. (2007a). This representation can also be used to determine the final behavior of the hazard rate of the system through the behavior of the hazard rate of the series systems. In particular, it can be used to show that the order statistics are, under some conditions, asymptotically hazard rate ordered. However, in general, this result is not true, that is, the order statistics need not be hazard rate ordered. 相似文献
35.
Susana Mendes M. José Fernández-Gómez Mário Jorge Pereira Ulisses Miranda Azeiteiro M. Purificación Galindo-Villardón 《Journal of applied statistics》2012,39(5):979-994
The wide-ranging and rapidly evolving nature of ecological studies mean that it is not possible to cover all existing and emerging techniques for analyzing multivariate data. However, two important methods enticed many followers: the Canonical Correspondence Analysis (CCA) and the STATICO analysis. Despite the particular characteristics of each, they have similarities and differences, which when analyzed properly, can, together, provide important complementary results to those that are usually exploited by researchers. If on one hand, the use of CCA is completely generalized and implemented, solving many problems formulated by ecologists, on the other hand, this method has some weaknesses mainly caused by the imposition of the number of variables that is required to be applied (much higher in comparison with samples). Also, the STATICO method has no such restrictions, but requires that the number of variables (species or environment) is the same in each time or space. Yet, the STATICO method presents information that can be more detailed since it allows visualizing the variability within groups (either in time or space). In this study, the data needed for implementing these methods are sketched, as well as the comparison is made showing the advantages and disadvantages of each method. The treated ecological data are a sequence of pairs of ecological tables, where species abundances and environmental variables are measured at different, specified locations, over the course of time. 相似文献
36.
Eduardo Martín Carla González‐García Jorge F. del Valle Amaia Bravo 《Child & Family Social Work》2018,23(1):1-7
Therapeutic residential care (TRC) is the name given to specialized children's homes for treating cases with severe emotional and behavioural problems that have been placed in residential care. A recent international review has revealed great diversity in the referral criteria of cases and in the models of intervention carried out. The goal of this study is to describe the population treated in these types of facilities in Spain and the therapeutic coverage given. The sample is made up of 215 young people in children's homes, of whom 93 are in TRC. The cases referred to TRC have been in residential care for less time but have gone through a greater number of placements. These young people also exhibit more problems of drug use, and there is a larger percentage of clinical‐range cases in the Child Behaviour Checklist scales of attention problems and aggressive behaviour. Nevertheless, the results of logistic regression indicate that the only variables that significantly increase the probability of being referred to TRC are drug use and changes of care placements. With regard to therapeutic care, there is a higher percentage in the TRC group receiving psychiatric care, and the sessions are also more frequent. 相似文献
37.
Emílio A. Coelho-Barros Josmar Mazucheli Jorge A. Achcar Kelly Vanessa Parede Barco José Rafael Tovar Cuevas 《Journal of applied statistics》2018,45(11):2081-2094
In this study, classical and Bayesian inference methods are introduced to analyze lifetime data sets in the presence of left censoring considering two generalizations of the Lindley distribution: a first generalization proposed by Ghitany et al. [Power Lindley distribution and associated inference, Comput. Statist. Data Anal. 64 (2013), pp. 20–33], denoted as a power Lindley distribution and a second generalization proposed by Sharma et al. [The inverse Lindley distribution: A stress–strength reliability model with application to head and neck cancer data, J. Ind. Prod. Eng. 32 (2015), pp. 162–173], denoted as an inverse Lindley distribution. In our approach, we have used a distribution obtained from these two generalizations denoted as an inverse power Lindley distribution. A numerical illustration is presented considering a dataset of thyroglobulin levels present in a group of individuals with differentiated cancer of thyroid. 相似文献
38.
In the context of local interpolators, radial basis functions (RBFs) are known to reduce the computational time by using a subset of the data for prediction purposes. In this paper, we propose a new distance-based spatial RBFs method which allows modeling spatial continuous random variables. The trend is incorporated into a RBF according to a detrending procedure with mixed variables, among which we may have categorical variables. In order to evaluate the efficiency of the proposed method, a simulation study is carried out for a variety of practical scenarios for five distinct RBFs, incorporating principal coordinates. Finally, the proposed method is illustrated with an application of prediction of calcium concentration measured at a depth of 0–20 cm in Brazil, selecting the smoothing parameter by cross-validation. 相似文献
39.
Michelle Ho Ninive Sanchez Laura K. Maurizi Cristina B. Bares Andrew Grogan-Kaylor Jorge Delva 《Child and Adolescent Social Work Journal》2013,30(3):197-215
The purpose of this study was to examine if adolescents’ reports of warm and harsh parenting practices by their mothers and fathers varied as a function of demographic, youth and their mothers or mother figures’ individual and family characteristics. Data are from 707 community-dwelling adolescents (mean age = 14, SD = 1.4) and their mothers or mother figures in Santiago, Chile. Having a warmer relationship with both parents was inversely associated with the adolescents’ age and positively associated with adolescents’ family involvement and parental monitoring. Both mothers’ and fathers’ harsh parenting were positively associated with adolescent externalizing behaviors and being male and inversely associated with youth autonomy and family involvement. These findings suggest that net of adolescent developmental emancipation and adolescent behavioral problems, positive relationships with parents, especially fathers, may be nurtured through parental monitoring and creation of an interactive family environment, and can help to foster positive developmental outcomes. 相似文献
40.
Lesbian,Gay, Bisexual,Transgender, Queer/Questioning (LGBTQ) Perceptions and Health Care Experiences
Gwendolyn P. Quinn Steven K. Sutton Brian Winfield Shannon Breen Jorge Canales Gina Shetty 《Journal of gay & lesbian social services》2013,25(2):246-261
The goal of this study was to explore attitudes, health knowledge, and experiences with health care setting and providers among lesbian, gay, bisexual, transgender, queer/questioning (LGBTQ) individuals and to identify areas for improvement. Members of Equality Florida? residing in the five counties of the Tampa Bay region were recruited through e-mail invitation to complete a 60-item questionnaire assessing demographics, attitudes, and experiences with health care providers (HCPs). Additional open-ended questions focused on experiences with HCPs and suggestions for ways to improve HCPs' cultural competency. A total of 632 respondents completed the survey of which 41% were gay men and 29% were lesbian. The majority of participants were White, non-Hispanic (93%), married/partnered (78%), and had health insurance (88%). The majority (67%) reported they always or often disclosed their sexual orientation/identity to an HCP and few had negative reactions in the health care setting (<10%). Health care settings with equality signs and gender-neutral language were perceived as safer. Participants' responses suggested need for policy changes and improved cultural competence among HCPs. Results show high rates of sexual orientation disclosure, greater acceptance from providers of LGBTQ status, and the need for examination of hospital policies and improved cultural competency. 相似文献