摘要:

A class of asymptotically distribution‐free tests is considered for comparing several treatments with a control when the, data are subject to unequal right‐censorship. A particular member of this class is proposed for use in practice and an illustrative numerical example is given. A general result for the Pitman efficacy of a test based on an asymptotically normal test statistic is proved for the multiparameter case and using this result the efficacy of the proposed class of tests is obtained under sequences of translation and proportional hazards alternatives. Simulation studies are conducted to compare the performance of the proposed test, in terms of power, with some other te

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01307.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

A smooth and detailed distribution is fitted to coarsely grouped frequency data by a nonparametric approach, based on penalized maximum likelihood. The estimated distribution conserves mean and variance of the data. The numerical solution is described and a compact and simplified algorithm is given. The procedure is applied to two empirical datasets.

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01308.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

For a balanced two‐way mixed model, the maximum likelihood (ML) and restricted ML (REML) estimators of the variance components were obtained and compared under the non‐negativity requirements of the variance components by Leeand Kapadia(1984). In this note, for a mixed (random blocks) incomplete block model, explicit forms for the REML estimators of variance components are obtained. They are always non‐negative and have smaller mean squared error (MSE) than the analysis of variance (AOV) estimators. The asymptotic sampling variances of the maximum likelihood (ML) estimators and the REML estimators are compared and the balanced incomplete block design (BIBD) is considered as a special case. The ML estimators are shown to have smaller asymptotic variances than the REML estimators, but a numerical result in the randomized complete block design (RCBD) demonstrated that the performances of the REML and ML estimators are not much different in the MSE

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01309.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

A survey is given of random graphs and random graph processes which can be used to describe and analyze networks that are changing with time. Marko‐vian change over time, log‐linear models for change, and conditionally uniform models for change are described. It is noted that estimation is usually complex if the random graph involves dependent dyads. Models with deterministic change over time may be a way to avoid the difficulties implied by dependent dyads. Logit regression methods are described that can be used to estimate such mod

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01310.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Various kinds of subgraph counts have been proposed as important statistics in the social sciences: for instance, in connection with studies of the structural properties of social networks. Since the empirical structure in question often involves an element of randomness, subgraph counts are random variables and, consequently, we need to describe their probabilistic properties. In this paper we give a survey of results dealing with the asymptotic distributions ofgeneralsubgraph counts for a number of standard graph distributions. Although we do not include proofs for all the results, we illustrate the methodology used through studies of asymptotic behaviour for certain subgraph counts.

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01311.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The gamma distribution function can be expressed in terms of the Normal distribution and density functions with sufficient accuracy for most practical purposes.The distribution function for the density xΛ‐1e‐x/μ/μΛΓ(A) on 0

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01312.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01313.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1991.tb01314.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY