摘要:

Certification of statistical practitioners has been under consideration by the American Statistical Association. This article discusses, through a series of examples, some problematic aspects of statistical practice that certification can help to ameliorate. An optional, limited certification program is advocated as an indirect mechanism for communicating values, concerning the validity of information and responsible use of data, which are not widely understood or attributed to the profession by society at large. How society perceives the roles and professional values of statisticians may be more important to the future of statistics than specific technical issues of practice.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476027

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476028

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476029

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

For random variables with a unimodal Legesgue density, the 3[sgrave] rule is proved by elementary calculus. It emerges as a special case of the Vysochanskiĭ-Petunin inequality, which in turn is based on the Gauss inequality.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476030

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

On the basis of an analysis of approximately 2,100 five-pin bowling scores, it is shown that the logarithms of bowling scores are approximately normally distributed. This distributional result is useful in calculating probabilistic quantities of interest.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476031

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Some issues in Pitman nearness comparison of certain estimators of a population variance are clarified. A general Rao-Blackwell-type result is presented. Some best estimators are derived, and their properties are discussed.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476032

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A simple, closed-form expression is derived for a linear smoothing spline. Examples are given of how this can be used as a pedagogical tool to help students understand the properties of smoothing splines and compare them with other nonparametric estimators.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476033

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

In a size-biased or weighted sample, the probability that a unit is sampled depends on a property of the sampling unit. Cars sampled by an observer traveling at a fixed velocity, v0, can be modeled as a size-biased sample because a car with a large absolute difference between its velocity and v0, is more likely to be sampled. A consistent estimator of the population mean velocity is found that depends solely on counts of the number of cars the observer passes and the number of cars that pass the observer. This estimator has the unusual property that when counts of passed and passing cars are equal, the sample median velocity and the estimated population mean velocity are both the observer's velocity, v0.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476034

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476035

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Much of the confusion surrounding interpretation and application of the coefficient of determination,R2, can be alleviated if it is defined explicitly as a comparison of a given model to the null modelEY= β0. The model-comparison definition allowsR2to be easily generalized, and standard extensions such as coefficients of partial determination are seen to be special cases of this generalization. Formulas become simpler, more unified, and more easily understood. Commonly cited problem areas such asR2for the no-intercept model and model comparisons using different values ofR2are also clarified by this perspective.

ISSN:0003-1305    

DOI:10.1080/00031305.1994.10476036

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor