A symbiotic business relationship exists between materials suppliers and construction contractors. Specifically, contractors must continually purchase materials on credit to complete projects, whilst suppliers exist on the profits made from selling such. In the absence of this indirect source of...

Two-level supersaturated designs (SSDs) are designs that examine more than n-1 factors in n runs. Although SSD literature for both construction and analysis is plentiful, the dearth of actual applications suggests that SSDs are still an unproven tool. Whether using forward selection or...

The addition of another fraction to an initial experiment is often necessary to resolve ambiguities involving aliasing of factorial effects. One of the most widely used techniques for the selection of a follow-up experiment is foldover. However, semifoldover (i.e., adding half of a foldover...

Acyclic probabilistic finite automata (APFA) constitute a rich family of models for discrete longitudinal data. An APFA may be represented as a directed multigraph, and embodies a set of context-specific conditional independence relations that may be read off the graph. A model selection...

Understanding the behaviour of the American put option is one of the classic problems in mathematical finance. Considerable efforts have been made to understand the asymptotic expansion of the optimal early exercise boundary for small time near expiry. Here we focus on the large-time expansion...

Franklin and Edwards state that concentrated poverty is the problem, and that a holistic, neighborhood based solution that is specific to the circumstances is the essential response. Citing Purpose Built’s successful work in Atlanta, Franklin and Edwards say the response must be integrated,...

CG-regressions are multivariate regression models for mixed continuous and discrete responses that result from conditioning in the class of conditional Gaussian (CG) models. Their conditional independence structure can be read off a marked graph. The property of collapsibility, in this context,...

This paper describes the development of a model to predict the hourly cost of downtime (using regression equations) for tracked hydraulic excavators operating in the UK opencast mining industry. A three-stage process was utilized for the model's development. The first stage predicted machine...