ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479898

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Extensions of time-series modeling procedures of Box and Jenkins [5] reveal that numerous economic variables which are generally regarded as being strongly interrelated may with equal validity, based on recent empirical evidence, be regarded as independent or only weakly related. Differences between these results and the bulk of econometric literature are attributed to the failure of the latter to satisfactorily account for autocorrelation. Due to limitations in the data, it is concluded that in many instances where economic relationships clearly do exist, econometric or other empirical means cannot reliably enable their existence to be ascertained.

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479899

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479900

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479901

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479902

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

This paper presents a number of analyses to assess the effects of various covariates on the survival of patients in the Stanford Heart Transplantation Program. The data have been updated from previously published versions and include some additional covariates, such as measures of tissue typing. The methods used allow for simultaneous investigation of several covariates and provide estimates of the relative risk of transplantation as well as significance tests.

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479903

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Some of the measures commonly used to describe association between two ordinal categorical variables, controlling for the effects of other ordinal categorical variables, are compared in their closeness to a corresponding conditional measure for an underlying jointly continuous distribution. Partial gamma and Kendall's partial tau are observed to be poorer than a weighted average of the Kendall's τb's from separate control levels, according to this criterion. The asymptotic sampling distribution of a particular weighted average measure is derived, and the behavior of the mean and asymptotic variance of such a measure is analyzed as the categorical variables are more finely measured.

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479904

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

This paper uses the unconditional mean square error of prediction as a criterion for comparing stopping rules used with the forward “stepwise” selection procedure in multivariate normal samples, based on simulations of 48 population correlation matrices. The CPstatistic, “Fto enter” (.15 < α < .25), a rule which minimizes the sample criterion, and one which sequentially tests the equality of the population criterion (.25 < α < .35) are superior. For these rules, the criterion seldom differs by more than three percent, although there are considerable differences between these and some of the other rules.

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479905

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

This paper investigates the power of two methodologies, the tests of Brown, Durbin, and Evans [2] and variable parameter regression, to detect several varieties of instability in the coefficients of a linear regression model. The study reported by Khan [10] on the stability of the demand for money is replicated with variable parameter regression, and his results are in part questioned and in part sharpened.

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479906

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The standard cubic spline regression method is shown to be a special case of the restricted least-squares estimator. The equivalence of the two procedures under a common set of restrictions is proved. The greater flexibility of the restricted least-squares estimator in terms of the number of restrictions and tests of hypotheses that can be utilized is illustrated by an application to a set of data that has been previously analyzed by the spline method.

ISSN:0162-1459    

DOI:10.1080/01621459.1977.10479907

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor