摘要:

“Cats is dogs and dogs is dogs and rabbits is dogs, and squirrels in cages is parrots ….”

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489951

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

In a completely saturated fractional factorial the two factor interactions are confounded in particular subsets with the main effects. It is possible to choose two different completely saturated factorials with different sets of interactions confounded with any given main effect. Examination of the numerical results obtained with each of the saturated designs will usually make it possible to identify two factor interactions when present.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489952

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

A method of obtaining symmetrical balanced fractions of 3nand 2m3nfactorial designs is proposed, based on an analysis of such designs into a complex of concentric hyperspheres in ann-dimensional factor space. Two examples are constructed, a half-replicate of a 34design and a half-replicate of a 2332design. Analysis shows both designs to have useful properties and to be relatively easy to analyse. Comparison is made with a half-replicate of a 2332design recently published by W. S. Connor.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489953

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

This paper discusses the problem of group screening methods whereinffactors are sub-divided into groups ofkfactors each, formingg“group-factors”. The group factors are then studied using a Plackett and Burman design in Q + 1 runs. The two versions of the group factors are formed by maintaining all component factors at their upper and lonrer levels respectively. All factors in groups found to have a large effects are then studied in a second stage of experiments. The author discusses the problems of detection and false detection of factors, optimum group size, size of program, and the role of costs in this sequential form of experimentation.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489954

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

The estimation of missing values for a general design is described and discussed. Formulae are provided for the estimation of missing values for two well-known, three factor, second order rotatable designs, with zero to six center points. A worked example illustrates the use of the formulae in the case of the cube plus octahedron plus one center point design.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489955

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

This paper considers a system whose components may be divided into two subsystems, each containing components whose lives are exponentially distributed but with different scale parameters. Each system can be assigned a store of replacement spares for failed components. Charts are presented for allocating a fixed number of spare components between the two sub systems to provide maximum reliability over some specified interval of time. Expected life is also taken as a maximand, and a table is given of combinations of spares of each type so as to maximize system life. The effect of non-exponential component densities upon these optimum allocations of components is also discussed.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489956

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

A description is given of new tables, more extensive and more accurate than any previously published, of the percentage points of the range and of the studentized range, for samples from a normal population. The purpose of this paper is to call attention to these tables and to illustrate their use. The following examples of the use of the tables are given: (1) an application of the percentage points of the range to tests of hypotheses concerning the standard deviation of a normal population; (2) an application of the percentage points of the range to rejection of outliers; and (3) an application of the percentage points of the studentized range to multiple comparisons tests on means of samples from a normal population.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489957

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

Environmental conditions do not usually remain fixed over the life history of an operating mechanism. This paper discusses several simple reliability functions and their moments taking into account possible hereditary effects, random operating conditions and other environmental influences.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489958

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

This paper presents an analysis of some data obtained from a life test on a group of relays. Observation of the data indicated that the fitting of the common failure distribution, the one parameter exponential, was not appropriate. As a result a model was used which assumes that the hazard rate, λ(x), is a step function. The method of maximum likelihood is used to estimate the different hazard rates and the points at which these rates change.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489959

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

Many practical problems arise in which the study of an asymmetric range of values of some variable is important. This paper treats two applications in which this kind of study is made. The first is a process start-up problem, and the other concerns inventory control.

ISSN:0040-1706    

DOI:10.1080/00401706.1961.10489960

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor