摘要:

AbstractThe problem of predicting the date of a developmental stage for plants or animals is formulated as a first passage time problem for a random process, e.g. accumulated degree‐days. By a suitable embedding in a continuous time model the likelihood becomes a smooth function of the parameters, which may be estimated by use of the maximum likelihood method. A set of data on waiting times from sowing to heading for spring barley is analysed. For data of this type we suggest models with variance components corresponding to stations and years. Modifications to take into account variables in addition to temperature, e.g. day length, soil properties and variety effects are briefly discussed. The transform both sides technique of CARROLLand RUPPERT(1984) is used to stabilize the variance and to achieve approximate normality of the residual

ISSN:0323-3847    

DOI:10.1002/bimj.4710330102

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractAn essential basis of medical diagnosis are biopotentials obtained from the body‐surface of the patients.If these time‐functions are to serve for computer‐aided diagnostics (using discrimination procedures) the known methods fail because of the existing small sample sizes for a large number of features (amplitudes).In the paper a method is given allowing discrimination of biopotentials also with such an extreme ratio of the number of features to the sample size.Furthermore, univariate tests are provided, enabling a decision to be made on whether the possibly arising distinctions may be attached to the mean values and/or the spectra of the underlying potentials.Clinical applications from the field of otolngical diagnostics demonstrate the usefulness of the described methods and show in particular their superiority compared with the known linear discriminance ana

ISSN:0323-3847    

DOI:10.1002/bimj.4710330103

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710330104

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper discusses analysis of dispersion tests in tables with spoiled data, that is, where some cells are missing. BENNETT(1987) gave a method for estimating the missing cells in a two‐way table and illustrated it with a simple example. This paper uses GLIMto estimate the models and indicates that the General Linear Model performs the computations without need to estimate the missing values. The binomial error model also may be used for this problem, and is the more natural approach to the proble

ISSN:0323-3847    

DOI:10.1002/bimj.4710330105

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710330106

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper is concerned with the generalized model E(φ(Y)!X) =φ(X) involving the transformations on both the predictor vectorXand the response variableY.For this purpose, Taylor expansions and canonical analysis are applied. For optimizing the expansions, it is shown by a simulation study that not only prediction error, the combination of model error and noise error, is an important index, but the distribution of the residuals and thet‐values of the coefficients also must be considered. Furthermore, the results of penicillin titrition show that the practical situations often need to be considered in selecting an appropriate model for a real‐life pr

ISSN:0323-3847    

DOI:10.1002/bimj.4710330107

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA statistic, derived from the combination of two dependent tests, is proposed for testing the hypothesis of equality of the means of a bivariate normal distribution with unknown common variance and correlation coefficient when observations are missing on one or both variates. The null distribution of the statistic is approximated by a well‐known distribution. The empirical powers of the statistic are computed and compared with some of the known statistics. The comparisons support the use of the proposed tes

ISSN:0323-3847    

DOI:10.1002/bimj.4710330108

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe asymptotic equivalence of nonparametric tests and parametric tests based on rank‐transformed data (CONOVERand IMAN, 1981) can be extended to the case of censoring. This paper presents generalized rank transformations for analyses of censored data, of interval‐censored data and of survival data with uncertain causes of death. A Monte Carlo study and an analysis of leukemia remission times demonstrate excellent agreement of suggested procedures with GEHAN'S(1965) and PRENTICE'S(1978) te

ISSN:0323-3847    

DOI:10.1002/bimj.4710330109

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710330110

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractAn adaptiveR‐estimator θAand an adaptive trimmed mean MAT are proposed. The performance of these and a number of other robust estimators are studied on real data sets, drawn from the astronomical, behavioural, biomedical, chemical, engineering and physical sciences. In the case of sets that can be assumed to have come from symmetric distributions, the best performer is θA. The next best performers are the Hodges‐Lehmann estimator, Bisquare (7.5) and Huber (1.5), in that order. MAT works well with all kinds of sets–symmetric or skewed. Extensions of these results to ANOVA and regression models are me

ISSN:0323-3847    

DOI:10.1002/bimj.4710330111

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY