摘要:

AbstractThis work discusses how two samplet‐tests behave when applied to data that may violate the classical statistical assumptions of independence, heteroscedasticity and Gaussianity. The usual two samplet‐statistic based on a pooled variance estimate and the Welch‐Aspin statistic are treated in detail. Practical “rules‐of‐thumb” are given along with their applications to various examples so that readers will easily be able to use such tests on their

ISSN:0323-3847    

DOI:10.1002/bimj.4710280202

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractIn this paper the analysis of genotypes obtained in diallel crossing system, including one set ofF1′sand parents, arranged in triangular table is given. This analysis is presented for data obtained from the experiments laid out in block designs. The analysis of variance, estimators of general and specific combining abilities as well as statistics for testing of hypotheses concerning those parameters are give

ISSN:0323-3847    

DOI:10.1002/bimj.4710280203

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710280204

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractMany statistical procedures assume a continuous model in spite of the fact that observations are necessarily discrete. Here we consider a simple ANOVA model—one factor with fixed effects—and assess the effect of categorisation by simulating sizes and calculating asymptotic relative efficiencies. Even for severe categorisation the effects are sm

ISSN:0323-3847    

DOI:10.1002/bimj.4710280205

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe log‐linear model is modified in order to adapt it to the disease‐genotype association problem, where two loci are involved. By so doing, the structure of associations among the genetic variables can be determined, and sources of distortion can be identified in certain test statistics and coefficients of associat

ISSN:0323-3847    

DOI:10.1002/bimj.4710280206

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710280207

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractSome experimental methods applied to biological investigations allow to find a numberqof homogeneous discrete components that determine a structure of the object in the study and the to establish the presence of some components from theseqin compositions of othernobjects. Such data form anXqincidence matrix. In this paper a statistical approach is suggested for revealing the associated components in two different structures of the object. The procedure is based on joint consideration of two sampling incidence matrices. An application of this method is demonstrated by analysis of relationships between antigens and proteins of one strain of cyanobacteria. The method may be useful in different scientific areas, e.g. psychology, when direct experimental comparison of components from two structures is difficult.

ISSN:0323-3847    

DOI:10.1002/bimj.4710280208

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710280209

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractFor modelling dose‐response relationships in case‐control studies the multiplicative logistic regression model, assuming the relative risk to be an exponential function of the dose, is widely known. If the relative risk is assumed to be a linear function of the dose, several authors (see e.g. BERRY (1980)) have proposed an additive (linear) model. This model has a better fit with the data if such a linear relation holds. Confidence limits for the relative risk derived from the information matrix, however, appear to be rather inaccurate. Therefore, use of the ‘standard’ logistic model in two different ways was studied: extension with a quadratic term or a logarithmic transformation of the dose. By applying the methods both to an empirical data set and in a simulation experiment, it is shown that appropriate transformation (often logarithmic) of the dosage and then applying the ‘standard’ logistic model is an useful approach if a linear dose‐response relat

ISSN:0323-3847    

DOI:10.1002/bimj.4710280210

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710280211

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY