Suppose that Z1, ... , ZN are iid according to a distribution F that is symmetric about [zeta]. Three widely used tests of H0: [zeta] = 0 against H1: [zeta] 0 are the t-, Wilcoxon and sign tests. Tests that reject when at least one of the above three tests exceeds the standard normal critical...

We show the best linear unbiased predictor (BLUP) can be derived as the best predictor (under normality) based on all error contrasts (i.e., transformation of data with mean 0). The result reveals an interesting connection between BLUP and REML--restricted or residual maximum likelihood--estimates.

Mixed effects models are often used in situations where responses are clustered. In this paper, we show that in the case of generalized linear mixed models where the cluster sizes are assumed to be independent random variables, whose joint distribution is unknown but does not depend on the...

A simple goodness-of-fit test is proposed for checking distributional assumptions in a model involving independent but not identically distributed random variables. The asymptotic distribution of the test statistic, which is similar to Pearson's [chi]2, is derived. The method is applied to...

As advanced traveler information systems become increasingly prevalent the importance of accurately estimating link travel times grows. Unfortunately, the predominant source of highway traffic information comes from single-loop loop detectors which do not directly measure vehicle speed. The...