Abstract:
:In this paper, a group sequential procedure for all-private comparisons of the means of k independent normal populations with a common known variance is proposed. A repeated range test is defined and its critical points are tabulated. The power function is studied and minimum group size needed to achieve a desirable power level is provided. The test can also be converted into a set of repeated simultaneous confidence intervals from which all-pairwise comparisons can be made. An example of the application of this new interference method is given.
journal_name
Biometricsjournal_title
Biometricsauthors
Liu Wsubject
Has Abstractpub_date
1995-09-01 00:00:00pages
946-55issue
3eissn
0006-341Xissn
1541-0420journal_volume
51pub_type
杂志文章相关文献
BIOMETRICS文献大全abstract::Linear multivariate theory is applied to the problem of combining several multivariate bioassays. Results are an asymptotic test of the hypothesis of a common log relative potency; the maximum likelihood estimator of the common log relative potency; and an exact and asymptotic confidence interval estimator for log rel...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1986-06-01 00:00:00
abstract::The approach to early termination for efficacy in a trial where events occur over time but the primary question of interest relates to a long-term binary endpoint is not straightforward. This article considers comparison of treatment groups with Kaplan-Meier (KM) proportions evaluated at increasing times from randomiz...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2007.00874.x
更新日期:2008-03-01 00:00:00
abstract::In a period starting around 2007, the Hand, Foot, and Mouth Disease (HFMD) became wide-spreading in China, and the Chinese public health was seriously threatened. To prevent the outbreak of infectious diseases like HFMD, effective disease surveillance systems would be especially helpful to give signals of disease outb...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12301
更新日期:2015-09-01 00:00:00
abstract::Tsiatis, Rosner, and Mehta (1984, Biometrics 40, 797-803) proposed a procedure for constructing confidence intervals following group sequential tests of a normal mean. This method is first extended for group sequential tests for which the sample sizes between interim analyses are not identical or the times are not equ...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1987-12-01 00:00:00
abstract::Multistage selection with fixed proportions and selection indices based on covariates of the target variable is studied. Assuming a multivariate normal distribution before the selection, expressions are presented for the expectation and the variance of the target variable in the retained subpopulation. As the numerica...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1991-03-01 00:00:00
abstract::Multipoint linkage analysis is being performed routinely in medical genetic studies to localize disease genes. This likelihood-based method is very computationally intensive. Exact computations are thus formidable for problems with large number of genetic markers and complex pedigrees. This paper proposes a Monte Carl...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1996-12-01 00:00:00
abstract::Bayesian methods are presented for assessing bioequivalence for studies in which a new formulation and a standard are administered simultaneously, and for Latin square designs which compare two or more new formulations to a standard. Two examples illustrate the application of the methods. ...
journal_title:Biometrics
pub_type: 临床试验,杂志文章
doi:
更新日期:1984-12-01 00:00:00
abstract::In multivariate recurrent event data regression, observation of recurrent events is usually terminated by other events that are associated with the recurrent event processes, resulting in informative censoring. Additionally, some covariates could be measured with errors. In some applications, an instrumental variable ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12857
更新日期:2018-09-01 00:00:00
abstract::Recent developments in the Cormack-Jolly-Seber (CJS) model for analyzing capture-recapture data have focused on allowing the capture and survival rates to vary between individuals. Several methods have been developed in which capture and survival are functions of auxiliary variables that may be discrete, constant over...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2005.00399.x
更新日期:2006-03-01 00:00:00
abstract::Conditional likelihood based on counting processes are combined with a Horvitz-Thompson estimator to yield a population size estimator that is more efficient than the existing ones. Random removals are allowed in the recapturing process. Simulation studies are shown to assess the performance of the proposed estimators...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.2002.00192.x
更新日期:2002-03-01 00:00:00
abstract::Petersen-type mark-recapture experiments are often used to estimate the number of fish or other animals in a population moving along a set migration route. A first sample of individuals is captured at one location, marked, and returned to the population. A second sample is then captured farther along the route, and in...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2011.01599.x
更新日期:2011-12-01 00:00:00
abstract::We introduce a nearly automatic procedure to locate and count the quantum dots in images of kinesin motor assays. Our procedure employs an approximate likelihood estimator based on a two-component mixture model for the image data; the first component has a normal distribution, and the other component is distributed as...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2010.01467.x
更新日期:2011-06-01 00:00:00
abstract::A broad approach to the design of Phase I clinical trials for the efficient estimation of the maximum tolerated dose is presented. The method is rooted in formal optimal design theory and involves the construction of constrained Bayesian c- and D-optimal designs. The imposed constraint incorporates the optimal design ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/1541-0420.00069
更新日期:2003-09-01 00:00:00
abstract::A Bayesian multivariate adaptive regression spline fitting approach is used to model univariate and multivariate survival data with censoring. The possible models contain the proportional hazards model as a subclass and automatically detect departures from this. A reversible jump Markov chain Monte Carlo algorithm is ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.1999.01071.x
更新日期:1999-12-01 00:00:00
abstract::Logistic regression is a popular tool for risk analysis in medical and population health science. With continuous response data, it is common to create a dichotomous outcome for logistic regression analysis by specifying a threshold for positivity. Fitting a linear regression to the nondichotomized response variable a...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12007
更新日期:2013-06-01 00:00:00
abstract::Assuming a model of proportional failure rates, Cox (1972) presents a systematic study of the use of covariates in the analysis of life time. The treatment of tied observations is a particularly troublesome point in both theory and application. It appears that grouping rather than discrete time is the right way to han...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1977-09-01 00:00:00
abstract::An efficient method is presented for analyses of death rated in one-way or cross-classified experiments where expected survival time for a patient at time of entry on trial is a function of observable covariates. The survival-time distribution used is a Weibull form of Cox's (1972) model. The analysis proceeds in two ...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1978-06-01 00:00:00
abstract::We extend the linear random-effects growth curve model (REGCM) (Laird and Ware, 1982, Biometrics 38, 963-974) to study the effects of population covariates on one or more characteristics of the growth curve when the characteristics are expressed as linear combinations of the growth curve parameters. This definition in...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1997-06-01 00:00:00
abstract::Bayesian experimental design is investigated for Bayesian analysis of nonlinear mixed-effects models. Existence of the posterior risk for parameter estimation is shown. When the same prior distribution is used for both design and inference, existence of the preposterior risk for design is also proven. If the prior dis...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341X.2004.00148.x
更新日期:2004-03-01 00:00:00
abstract::Spatial replication is a common theme in count surveys of animals. Such surveys often generate sparse count data from which it is difficult to estimate population size while formally accounting for detection probability. In this article, I describe a class of models (N-mixture models) which allow for estimation of pop...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341X.2004.00142.x
更新日期:2004-03-01 00:00:00
abstract::Integration of genomic data from multiple platforms has the capability to increase precision, accuracy, and statistical power in the identification of prognostic biomarkers. A fundamental problem faced in many multi-platform studies is unbalanced sample sizes due to the inability to obtain measurements from all the pl...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12587
更新日期:2017-06-01 00:00:00
abstract::A class of adaptive weighted log-rank statistics is described where the vector of weights is chosen in a data-dependent way from a family of "smooth" weight vectors. A parametric family of weight vectors is identified which includes most shapes of weighting vectors that will be near optimal in many cancer prevention a...
journal_title:Biometrics
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1991-09-01 00:00:00
abstract::The concentration of carbon monoxide in the blood of a cigarette smoker varies in response to the frequency and dose of CO delivered by the cigarettes he smokes and by the rate at which CO washes out of his blood. Moments of first passage times or exit times above a nominal threshold can be calculated using a stochast...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1979-09-01 00:00:00
abstract::In this article, we present new methods to analyze data from an experiment using rodent models to investigate the role of p27, an important cell-cycle mediator, in early colon carcinogenesis. The responses modeled here are essentially functions nested within a two-stage hierarchy. Standard functional data analysis lit...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2007.00846.x
更新日期:2008-03-01 00:00:00
abstract::Using genetic recombination data to make inferences about chiasmata on the tetrad during meiosis is a classic problem dating back to Weinstein's paper in 1936 (Genetics 21, 155-199). In the last few years, Weinstein's methods have been revived and applied to new problems, but a number of important statistical issues r...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.2002.00369.x
更新日期:2002-06-01 00:00:00
abstract::In this article, we present an estimation approach for solving nonlinear constrained generalized estimating equations that can be implemented using object-oriented software for nonlinear programming, such as nlminb in Splus or fmincon and lsqnonlin in Matlab. We show how standard estimating equation theory includes th...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.2000.01268.x
更新日期:2000-12-01 00:00:00
abstract::In longitudinal observational studies, repeated measures are often taken at informative observation times. Also, there may exist a dependent terminal event such as death that stops the follow-up. For example, patients in poorer health are more likely to seek medical treatment and their medical cost for each visit tend...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2007.00954.x
更新日期:2008-09-01 00:00:00
abstract::Interference occurs when the treatment of one person affects the outcome of another. For example, in infectious diseases, whether one individual is vaccinated may affect whether another individual becomes infected or develops disease. Quantifying such indirect (or spillover) effects of vaccination could have important...
journal_title:Biometrics
pub_type: 杂志文章,随机对照试验
doi:10.1111/biom.12184
更新日期:2014-09-01 00:00:00
abstract::We propose a new criterion for confounder selection when the underlying causal structure is unknown and only limited knowledge is available. We assume all covariates being considered are pretreatment variables and that for each covariate it is known (i) whether the covariate is a cause of treatment, and (ii) whether t...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2011.01619.x
更新日期:2011-12-01 00:00:00
abstract::In large cohort studies, it often happens that some covariates are expensive to measure and hence only measured on a validation set. On the other hand, relatively cheap but error-prone measurements of the covariates are available for all subjects. Regression calibration (RC) estimation method (Prentice, 1982, Biometri...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2009.01295.x
更新日期:2010-06-01 00:00:00