摘要:

AbstractThe quality of ordered categorical recordings is determined from repeated measurements on the same subject in order to assess the level of agreement between raters, scales or occasions. The presented rating‐invariant method for ordered categorical data provides means of analysing the quality of single‐item rating scales, irrespective of the number of possible response values and the marginal distributions. Marginal heterogeneity implies systematic disagreement, so‐called bias. An augmented ranking approach is the basis for the separation of inter‐rater disagreement into systematic and random components. Correlation between pairs of augmented rank values provides a measure of agreement to the best common ordering of paired classifications, given inter‐rater bias. The essential differences in interpretation and applicability of the proposed coefficient of agreement and the Spearman rank‐order correlation for ordered categorical data ar

ISSN:0323-3847    

DOI:10.1002/bimj.4710390602

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

ISSN:0323-3847    

DOI:10.1002/bimj.4710390603

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractThe problem considered in this paper is the estimation of the underlying order ofmphysiological changes from incomplete observations. The observations are incomplete in the sense that, for each individual in the sample, only the identity, but not the order, of the firstk

ISSN:0323-3847    

DOI:10.1002/bimj.4710390604

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractThe Wald‐Wolfowitz test and the Kolmogorov‐Smirnov test are two well‐known tests which can be used to test for differences between two population distributions, where these distributions could differ in means, variances or shapes. This paper compares the simulated power of the Wald‐Wolfowitz test to that of the Kolmogorov‐Smirnov test in several situations. Differences in location only, differences in variance only, and differences in both location and variance are considered. In most cases, equal sample sizes of 10 and 20

ISSN:0323-3847    

DOI:10.1002/bimj.4710390605

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractForJdependent groups, let θj,j= 1, …,J, be some measure of location associated with thejth group. A common goal is computing confidence intervals for the pairwise differences, θj— θk,j

ISSN:0323-3847    

DOI:10.1002/bimj.4710390606

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractA two stage without replacement strategy is proposed for estimating the population mean of overlapping clusters of contacts of tuberculosis cases. This sampling strategy is an improvement over the two sampling strategies proposed by SINGH (1988). A numerical illustration is provided by taking two populations of tuberculosis contacts from New York City; the percentage gain in efficiency varies from 3.70 to 24.99. The proposed improved sampling strategy may be useful to other contagious diseases in the different fields of biomedical sciences or similar situations in other fields.

ISSN:0323-3847    

DOI:10.1002/bimj.4710390607

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractA type of distribution induced by the linear birth‐and‐death processes is useful in modeling certain biological phenomena. In addition to extending some existing results, new findings are presented concerning the mathematical properties of the distribut

ISSN:0323-3847    

DOI:10.1002/bimj.4710390608

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractEmphasizing that model development should be in accordance with the context under consideration, a model for plant nitrogen uptake is developed for use in connection with soil nitrogen models. The aim of the modeling is to improve the accuracy in model simulations of plant nitrogen uptake by application of optimization theory and apriori information of plant nitrogen content. A simple soil nitrogen model is coupled to the plant nitrogen uptake model, and solutions, obtained by two different methods, are presented. Suggestion for how to use the modeling principles in connection with a more complex plant nitrogen uptake model, and apriori information of plant dry weight, is given. It is believed that the modeling principles can also be used on other types of dynamic models with given apriori information.

ISSN:0323-3847    

DOI:10.1002/bimj.4710390609

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractBy treating the nonlinear model as if it were linear in the parameterization θ in the neighbourhood of the least squares estimate θC, two‐sided nominally‐q‐prediction intervals can be constructed by applying the usual linear model theory. The quadratic approximation of the expected coverage of the prediction intervals is derived for ap‐parameter nonlinear model. An adjustment of the nominally‐q‐prediction intervals is proposed. It is shown that, to the extent that quadratic approximation is adequate, the actual expected coverage of the adjusted prediction

ISSN:0323-3847    

DOI:10.1002/bimj.4710390610

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractWell‐known allometric model is critically reviewed for determining the length‐weight relationship. Procedure to be followed for applying this model under the assumption of multiplicative as well as additive error is discussed. The possibility of autocorrelations in error term is explored. It has been demonstrated that the usual allometric relationship does not always work satisfactorily. Accordingly, a generalization of this model is studied in detail. As an illustration, this generalized version of allometric model is used to determine the length‐weight relationship of some data on the Indian pearl o

ISSN:0323-3847    

DOI:10.1002/bimj.4710390611

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY