摘要:

Early occurrence of certain events such as failure or repairs is a common phenomenon in the lifetime of industrial products. Often, the log normal distribution has been found as a useful model to be applicable whenever the early occurrences dominate a lifetime distribution. In this paper we suggest the use of the inverse Gaussian distribution for a model of such lifetime behavior and discuss different reliability features of the distribution. It is shown that its failure rate is nonmonotonic, initially increasing and then decreasing. Advantages in the use of the inverse Gaussian over the log normal are given. Certain numerical results are presented for illustration.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489586

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

We discuss the problem of predicting, on the basis of a sample from a two parameter exponential distribution, thes'th smallest observationYsin a future sample ofnobservations for the same distribution, and the mean Y of the future sample. It is shown how to obtain prediction intervals forYsand Y, based on a Type II censored sample from the distribution.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489587

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

This note presents a table of the large sample covariance matrix of the maximum likelihood (ML) estimates of parameters of a smallest extreme value distribution. The table can be used to obtain approximate large-sample confidence intervals when a Weibull (or smallest extreme value distribution) is fitted by ML to singly censored data. Use of the table is illustrated with such data on the life of locomotive controls.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489588

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

A multivariate time series procedure of modeling closed-loop systems from operating data is outlined and illustrated by real life data from a paper-making process. The procedure does not require a priori knowledge, sample correlations or spectra for guessing the model form. The paper also illustrates a simple method of obtaining the minimum mean squared error control equation and ascertaining the performance of the existing control strategy.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489589

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Five programs for selection of variables in discriminant analysis are compared: the program DISCRIM of McCabe [8]. the BMD07M program, see Dixon [1], the program ALLOC-I of Habhema, Hermana and van den Broek [3], and two more recent programs: SPSS and BMDP7M, see Nie e.a. [10] and Dixon [2]. Emphasis is on the criteria for selection and on the distributional assumptions involved. The programs are compared experimentally using two examples: one with real data, also used by McCabe [8], and one with simulated data.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489590

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

In this paper we consider a class of distribution-free two-stage two-sample median tests for location differences. Exact null distribution tables are provided and a negative binomial approximation is presented for obtaining approximate α level cutoff points. The test procedures have the capability of obtaining asymptotic power restrictions against alternatives of interest and are particularly appropriate for competitor product testing settings. Criteria for selecting a particular test from the class are discussed.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489591

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

In this article, a study is made about a shift in the mean of a set of independent normal random variables with unknown common variance. The marginal and joint posterior distributions of the unknown time point and the amount of shift are derived. Small and large sample results are presented.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489592

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Let (X1,X2,Xs) be a continuous, trivariate random vector for which it is of interest to compare the correlation betweenX1andX2with that betweenX3andX1. This problem is important, for example when bothX2andX3are potential linear predictors forX1or, more generally, whenever the variable (X1.X2,X3) represents a triplet of measurements on the same individual and correlation comparisons are desired. In this note it is shown that an exact distribution-free test for such problems can he based on a single Kendall correlation coellicient.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489593

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

A class of orthogonal main-effect plans for 4.2mexperiments is constructed. These plans are saturated and provide orthogonal estimates of the mean and all main-effects when all interactions are assumed to be Lero.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489594

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Efroymsen's method of checking tolerance in matrix inversion is a popular technique to avoid inverting singular and nearly singular covariance matrices. Recently Berk showed that the Efroymsen tolerance check is theoretically unsatisfactory. A simple modification of the Efroymsen tolerance check is given here that provides a proper tolerance test.

ISSN:0040-1706    

DOI:10.1080/00401706.1977.10489595

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor