ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00419.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryWe describe how a log‐linear model can be used to compute the nonparametric maximum likelihood estimate of the survival curve from interval‐censored data. This permits such computation to be performed with the aid of readily available statistical software such as GLIM or SAS. The method is illustrated with reference to data from a cohort of Danish homosexual men, each of whom was tested for HIV positivity on one or more of six possible follow‐up

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00420.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummarySweeting&Adekola (1987) presented a fairly general set of conditions, covering a wide class of problems, that establish asymptotic posterior normality for stochastic processes. In this paper, this theory is illustrated via a non‐ergodic example, namely, the class of non‐homogeneous birth proces

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00421.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThis paper considers estimation of β in the regression model y =Xβ+μ, where the error components in μ have the jointly multivariate Student‐tdistribution. A family of James‐Stein type estimators (characterised by nonstochastic scalars) is presented. Sufficient conditions involving onlyXare given, under which these estimators are better (with respect to the risk under a general quadratic loss function) than the usual minimum variance unbiased estimator (MVUE) of β. Approximate expressions for the bias, the risk, the mean square error matrix and the variance‐covariance matrix for the estimators in this family are obtained. A necessary and sufficient condition for the dominance of this family over MVUE is

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00422.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryIt is shown that members of a class of two‐level nonorthogonal resolution IV designs withnfactors are strongly resolvable search designs whenk, the maximum number of two‐factor interactions thought possible, equals one; weakly resolvable whenk =2 except when the number of factors is 6; and may not be weakly resolvable whenk

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00423.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThe concepts of the Bernoulli count process of a point process and Bernoulli sampling of a discrete parameter stochastic process are introduced. The Bernoulli count process determines the stochastic structure of the point process, and a process obtained by thinning a discrete parameter stochastic process by Bernoulli sampling satisfies the same property. Stationarity and the Markov property remain invariant under Bernoulli sampling.

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00424.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryWe give two simple approximations for evaluating the cumulative probabilities of the doubly noncentralzdistribution. These can easily be used for evaluating the cumulative probabilities of the doubly noncentralFdistribution as well. We compare our results with those obtained by Tiku (1965) using series expansion. An industrial situation where a quality characteristic of interest follows the doubly noncentral z distribution is also cited. However, in this case the exact probabilities could be calculated using results on the ratio of two normal variables.

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00425.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryConsiderkindependent observationsYi(i= 1,.,k) from two‐parameter exponential populationsiwith location parameters μ and the same scale parameter If the μiare ranked as consider population as the “worst” population and IIp(k)as the “best” population (with some tagging so thatp{)andp(k)are well defined in the case of equalities). If theYiare ranked as we consider the procedure, “Select provided YR(k)Yr(k)is sufficiently large so that is demonstrably better than the other populations.” A similar procedure is studied for selecting the “demonstrably

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00426.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryWhen the infection rate associated with an epidemic appears to decline over time, one explanation is a constant level of infectiousness combined with heterogeneity among the susceptible population. In this paper we consider random effects models for such heterogeneity, particularly in discrete time. Maximum likelihood techniques are discussed as well as a more convenient approach based on martingale estimating equations. An application to data on a smallpox outbreak is considered.

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00427.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryA robust estimation procedure for the bifurcating autoregressive model in cell lineage studies is proposed. The method is illustrated by application to a real data set and is compared with least squares estimates in a small simulation study.

ISSN:0004-9581    

DOI:10.1111/j.1467-842X.1991.tb00428.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY