The histograms of interpurchase times for frequently purchased packaged goods have consistently shown pronounced seven-day cycles. Evidence supports that the weekly spike phenomenon is the result of consumers' regular shopping trip schedules. We explore the implications of this peculiar...

Dilated cardiomyopathy is a disease of unknown cause characterized by dilation and impaired function of one or both ventricles. Most cases are believed to be sporadic, although familial forms have been detected. The familial form has been estimated to have a relative frequency of about 25%....

Leave-one-out and 632 bootstrap are popular data-based methods of estimating the true error rate of a classification rule, but practical applications almost exclusively quote only point estimates. Interval estimation would provide better assessment of the future performance of the rule, but...

Pairwise comparison procedures are important and popular statistical techniques in many disciplines, such as physiology and agrobiology. In this paper, we seek to derive the statistical methods which enable one to perform pairwise comparisons in a two-way analysis of covariance model. The...

The local influence method is adapted to canonical correlation analysis for the purpose of investigating the influence of observations. We consider a perturbation based on the empirical distribution function. An illustrative example is given to show the effectiveness of the local influence...

Consider the regression model y = beta 0 1 + Xbeta + epsilon. Recently, the Liu estimator, which is an alternative biased estimator beta L (d) = (X'X + I) -1 (X'X + dI)beta OLS , where 0d1 is a parameter, has been proposed to overcome multicollinearity . The advantage of beta L (d) over the...

Exact and approximate methods are developed to calculate the required number of subjects n in a repeatability study, where repeatability is measured by the precision of measurements made by a rater. The exact method is based on power calculations under the non-null distribution of the multiple...

Chen (1999) proposed an economic design, using Taguchi's quality loss function, for choosing a producer's lower specification limit eta for a product with a quality characteristic that has an exponential distribution with mean θ and 'the larger the better' tolerance. Chen (1999) developed an...

Tail probabilities are calculated by saddle-point approximation in a probabilistic-statistical model for the accumulated splice loss that results from a number of fusion splices in the installation of fibre-optic networks. When these probabilities, representing the risk of exceeding a specified...

Virtually all models for the utility of personnel selection are based on the average criterion score of the predictor selected applicants. This paper indicates how standard results from the theory on order statistics can be used to determine the expected value, the standard error and the...