Biometrika

最新文章

• ON CONDITIONING FOR MODEL-BASED INFERENCE IN SURVEY SAMPLING AI翻译
  作者：SKINNER, CJ
  摘要：A ''discontinuity'' of sampling distribution inference between a prediction problem and an estimation problem in model-based survey sampling is discussed. The problem is resolved by conditioning on an appropriate ancillary within a curved exponential family framework. The ignorability of the sampling design for inference is discussed.
• ESTIMATING POPULATION-SIZE BY RECAPTURE SAMPLING AI翻译
  作者：NAYAK, TK
  摘要：A design called recapture debugging is proposed to get extra information to estimate the original number of faults, N, in a reliability system. The system is observed for a fixed amount of time .tau. and the failures are assumed to follow an exponential law with an unknown common parameter .lambda.. The maximum likelihood and moment estimators of N and .lambda. are derived and compared with the existing estimators. The recapture sampling provides substantially more information and improved est...
• ODDS RATIO INFERENCE WITH DEPENDENT DATA - A RELATIONSHIP BETWEEN 2 PROCEDURES AI翻译
  作者：DONNER, A
  摘要：Liang (1985) proposed an alternative to the Mantel-Haenszel procedure for testing the significance of an estimated common odds ratio when the binomial assumption for the observed cell frequencies is relaxed. It is shown that this procedure is a form of Fisher''s one-sample permutation test.
• A MULTINOMIAL BAYESIAN-APPROACH TO THE ESTIMATION OF POPULATION AND VOCABULARY SIZE AI翻译
  作者：BOENDER, CGE; KAN, AHGR
  摘要：We approach estimation of the size of a population or a vocabulary through a Bayesian analysis of the multinomial distribution. We view the sample as being generated from such a distribution with an unknown number of cells and unknown cell probabilities, and develop a Bayesian procedure to estimate the number of cells and the coverage of the sample. The prior distribution of the number of cells is arbitrary. Given that number, the cell probabilities are assumed to follow a symmetric Dirichlet ...
• A TEST TO DETECT CLUSTERS OF DISEASE AI翻译
  作者：WHITTEMORE, AS; FRIEND, N; BROWN, BW; HOLLY, EA
  摘要：A test is given to detect clustering in disease incidence or mortality data. The test statistic is the mean distance between all pairs of disease cases. Its null mean and variance and its asymptotic normality are derived under assumptions that accommodate differences in population distribution among demographic subgroups at different disease risk. The test is illustrated on 63 cases of anal and rectal squamous cell carcinoma in San Francisco during 1973-1981.
• LOGISTIC-REGRESSION ANALYSIS OF SAMPLE SURVEY DATA AI翻译
  作者：ROBERTS, G; RAO, JNK; KUMAR, S
  作者单位：Carleton University
  摘要：Standard chi-squared, X2, or likelihood ratio, G2, test statistics for logistic regression analysis, involving a binary response variable, are adjusted to take account of the the survey design. These adjustments are based on certain generalized design effects. Logistic regression diagnostics to detect any outlying cell proportions in the table and influential points in the factor space are also developed, taking account of the survey design. Finally, the results are used to analyse some data f...
• THE PROBABILITY INTEGRALS OF BIVARIATE NORMAL-DISTRIBUTIONS - A CONTINGENCY TABLE APPROACH AI翻译
  作者：WANG, YCJ
  作者单位：Rutgers University System; Rutgers University New Brunswick; Rutgers University Camden
  摘要：After partitioning the plane into fine rectangular regions, the bivariate normal probability integrals over all the rectangular regions can be considered as a population contingency table. The row and column marginals of this contingency table are two discretized univariate normal distributions. The logarithm of the local cross-product ratios are approximately linear. Given the correlation coefficient of the bivariate normal, a contingency table with discretized normal marginals and proper cro...
• RERANDOMIZING THE MEDIAN IN MATCHED-PAIRS DESIGNS AI翻译
  作者：WELCH, WJ
• DIAGNOSTIC AND SAMPLING MODELS IN SCREENING AI翻译
  作者：BOYS, RJ; DUNSMORE, IR
  作者单位：University of Sheffield
  摘要：Screening methods are developed which raise the proportion of successes in the retained population to a predetermined level. Specification regions for the screening variables are derived within both the diagnostic and sampling paradigms (Dawid, 1976). Logistic and normal models are used for the two frameworks and the results are illustrated by an example of screening for malnourishment.
• A SIMPLE TEST OF THE PROPORTIONAL HAZARDS ASSUMPTION AI翻译
  作者：GILL, R; SCHUMACHER, M
  作者单位：University of Freiburg
  摘要：A new test of the proportional hazards assumption for two-sample censored data is presented. The test is based on a comparison of different generalized rank estimators of the relative risk. Asymptotic normality and consistency against alternatives with monotone hazard ratio are shown and relationships to other proposals are pointed out. A related graphical method is presented and recommendations for the choice of appropriate weight functions are given. The strengths and weaknesses of the test ...