We develop tests of the proportional hazards assumption, with respect to a continuous covariate, in the presence of unobserved heterogeneity with unknown distribution at the individual observation level. The proposed tests are specially powerful against ordered alternatives useful for modeling...

We propose Bayesian inference in hazard regression models where the baseline hazard is unknown, covariate effects are possibly agevarying (non-proportional), and there is multiplicative frailty with arbitrary distribution. Our framework incorporates a wide variety of order restrictions on...

Several omnibus tests of the proportional hazards assumption have been proposed in the literature. In the two-sample case, tests have also been developed against ordered alternatives like monotone hazard ratio and monotone ratio of cumulative hazards. Here we propose a natural extension of these...

This paper considers empirical work relating to models of firm dynamics. We show that a hazard regression model for firm exits, with a modification to accommodate age-varying covariate effects, provides an empirical framework accommodating many of the features of interest in studies on firm...

<title>Abstract</title> Spatial heterogeneity, spatial dependence and spatial scale constitute key features of spatial analysis of housing markets. However, the common practice of modelling spatial dependence as being generated by spatial interactions through a known spatial weights matrix is often not...

The proliferation of new information technologies throughout the world has raised some important questions for policymakers as to how developing countries can benefit from their diffusion. This important volume compares the advantages and disadvantages of the IT revolution through detailed...

Socioeconomic characteristics, health behaviours, and the utilisation and quality of healthcare are prime examples of socioeconomic, cultural and demographic phenomena that are inherently spatial in nature. Understanding the spatial structure of these factors is particularly relevant in order to...

The expert contributors illustrate that sources of regional competitiveness are strongly linked with spatially observable yet increasingly flexible realities, and include building advanced and efficient transport, communications and energy networks, changing urban and rural landscapes, and...

The vast majority of spatial econometric research relies on the assumption that the spatial network structure is known a priori. This study considers a two-step estimation strategy for estimating the <em>n(n-1)</em> interaction effects in a spatial autoregressive panel model where the spatial dimension...

‘Operating leverage’describes the extent to which a …Firm’s operating costs are fi…xed in the short term. Operating leverage ampli…es the earnings impact of a change in revenues; an effect which is further amplified by fi…nancial leverage and by non-proportionality in...