An experiment was carried out to test the various assumptions usually made when evaluating statistical procedures for estimating the parameters of the Michaelis Menten equation, which describes enzyme-catalyzed reactions. The usual assumption of normality is not strongly supported, but is...

A generalized likelihood ratio procedure and a Bayes procedure are considered for change-point problems for the mean direction of the von Mises distribution, both when the concentration parameter is known and when it is unknown. These tests are based on sample resultant lengths. Tables that list...

The Regional Meteorological Service for the Emilia-Romagna Region manages a network of automatic weather stations equipped with electronic sensors suitable for measuring meteorological parameters. The automatic stations consist of electronic instruments, which are subject to failures at more or...

This paper examines the robustness of control schemes to data conditional heteroscedasticity. Overall, the results show that the control schemes which do not account for heteroscedasticity fail in providing reliable information on the status of the process. Consequently, incorrect conclusions...

This paper introduces a generalization of the normal distribution: the uniform power distribution. It is a symmetric and unimodal family of distributions, defined on the real line, and is closely related to the exponential power family. The exponential power family was introduced to allow the...

Longitudinal data with non-response occur in studies where the same subject is followed over time but data for each subject may not be available at every time point. When the response is categorical and the response at time t depends on the response at the previous time points, it may be...

This paper uses Monte Carlo simulations to analyze the performance of several seasonal unit root tests for monthly time series. The tests are those of Dickey, Hasza and Fuller (DHF), Hylleberg, Engle, Granger and Yoo (HEGY), and Osborn, Chui, Smith and Birchenhall (OCSB). The unit root test of...

In this study, the method of local influence, which was introduced by Cook as a general tool for assessing the influence of local departures from the underlying assumptions, is applied to ridge regression, by defining the maximum pseudo-likelihood ridge estimator obtained using the augmentation...

Designs of partial diallel crosses obtained by including parents based on rectangular and cubic association schemes have been presented. In addition, a simplified method of their analysis by making use of latent roots and idempotent matrices has also been presented. The method has been...

In international trade analysis between countries, the central theme is the examination of whether or not there are any significant diff erences between the actual trade and potential trade, given the determinants of trade flows. Thus, estimating the potential trade is an important component in...