摘要:

The possibility that the apparent direction of an association will be reversed when covariates are taken into account is well known, but many examples of this effect are rather contrived. A real example from an epidemiological survey is presented.

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473563

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The value to students ofactivelearning has been recognized. This has led to the wide use of assignments in statistical methods courses where students use statistical software and computing equipment to analyze data. These assignments enable most students to master themechanicsof data analysis. The amount of experience that a student can get with such assignments is, however, limited. A sizable proportion of students have difficulty grasping some of the manyconceptsthat are introduced in these courses. Nevertheless, these concepts are important for effective modeling and data analysis, and instructors should focus on them. By using current computing technology, it is possible to supplement standard data analysis assignments and algebraic derivations and have students become actively involved in the learning of important statistical concepts. The learning experience can be enhanced by giving students additional statistical “experiences” by using combinations of carefully designed and implemented multiple simulations and dynamic graphics to illustrate key ideas. In this article we describe and illustrate several instructional modules and corresponding software that have been designed to assist instructors in teaching introductory statistics courses.

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473564

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The distribution of the number of batters faced and the number of runs scored in an inning is fundamental to modeling pitcher performance in major league baseball. Until 1984 sufficiently detailed data on a play-by-play basis were available only for special games, for example, World Series games. Play-by-play data have become available for each league beginning with the 1984 season, and we use them for the 1990 American League season. We found that a minor change from the negative binomial model provided an adequate fit to the distribution of the number of batters faced. However, the distribution of the number of runs scored is complex and involves a convolution of the distribution of the number of batters faced and the conditional distribution of the number of runs scored given a specific number of batters faced. We modeled the latter by a truncated binomial distribution where the probability of a run scoring was a logistic function of the number of batters faced. The goodness of the fit of each of the models was tested on 77 starting pitchers who pitched in the first three innings of enough games to total at least 30 innings, all cumulating for these pitchers to 5,639 innings during the 1990 American League season.

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473565

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

There are a large number of different definitions used for sample quantiles in statistical computer packages. Often within the same package one definition will be used to compute a quantile explicitly, while other definitions may be used when producing a boxplot, a probability plot, or a QQ plot. We compare the most commonly implemented sample quantile definitions by writing them in a common notation and investigating their motivation and some of their properties. We argue that there is a need to adopt a standard definition for sample quantiles so that the same answers are produced by different packages and within each package. We conclude by recommending that the median-unbiased estimator be used because it has most of the desirable properties of a quantile estimator and can be defined independently of the underlying distribution.

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473566

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Suppose thatXiare independent random variables, and thatXihas cdfFi(x), 1 ≤i≤k.Many statistical problems involve the probability Pr{X1<X2< ··· <Xk}. In this note a numerical method is proposed for computing this probability.

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473567

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473569

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Models of kinetic phenomena can be written down as differential equations or their implicit or explicit integrated forms, usually with time as the independent variable. Thus we are concerned with change and rates of change of variables of interest. This review considers MLAB, MATLAB, PCNONLIN, SCIENTIST, and S-PLUS in terms of their capabilities to estimate such models. Our examination includes both features and style of the packages considered, but focuses on kinetic modeling rather than a comprehensive review of the software.

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473570

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A First Course in Business Statistics (6th ed.).; J. T. Mcclave, P. G. Benson, and T. Sincich. Englewood Cliffs, NJ: Prentice-Hall, 1995, xx + 746 pp. Reviewed by Joan M. Donohue

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473571

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473572

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0003-1305    

DOI:10.1080/00031305.1996.10473573

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor