Abstract: In diagnostic medicine, there is great interest in developing strategies for combining biomarkers in order to optimize classification accuracy. A popular model that has been used when one biomarker is available is the binormal model. Extension of the model to accommodate multiple...

In diagnostic medicine, there is great interest in developing strategies for combining biomarkers in order to optimize classification accuracy. A popular model that has been used for receiver operating characteristic (ROC) curve modelling when one biomarker is available is the binormal model....

We investigate the nonparametric estimation of Kendall's coefficient of concordance, τ, for measuring the association between two variables under bivariate censoring. The proposed estimator is a modification of the estimator introduced by Oakes (1982), using a Horvitz-Thompson-type correction...

In this note we propose a simple method of measuring directional predictability and testing for the hypothesis that a given time series has no directional predictability. The test is based on the correlogram of quantile hits. We provide the distribution theory needed to conduct inference,...

In this chapter, William Scarth examines the relationship between population aging, productivity and growth in living standards and reaches a more optimistic conclusion about the effects of aging on productivity. Indeed, he finding that aging may in fact lead to increases in productivity, even...

Zambia’s experience in the 1990s illustrates that, on their own, policy changes will not redress decades of mismanagement, especially when the degree of commitment of the elite remains unaltered. In 1991, the Movement for Multiparty Democracy won the elections on a reform platform, promising...

A distinguishing aspect of the growth performance is that India now has five mobile phones for every one fixed telephone and the monthly additions to mobile subscribers are well over six million. Such a huge growth in telecom services have a number of spillover effects for rest of the economy...