Pattern extraction for high-risk accidents in the construction industry: a data-mining approach

Accidents involving falls and falling objects (group I) are highly frequent accidents in the construction industry. While being hit by a vehicle, electric shock, collapse in the excavation and fire or explosion accidents (group II) are much less frequent, they make up a considerable proportion of severe accidents. In this study, multiple-correspondence analysis, decision tree, ensembles of decision tree and association rules methods are employed to analyse a database of construction accidents throughout Iran between 2007 and 2011. The findings indicate that in group I, there is a significant correspondence among these variables: time of accident, place of accident, body part affected, final consequence of accident and lost workdays. Moreover, the frequency of accidents in the night shift is less than others, and the frequency of injury to the head, back, spine and limbs are more. In group II, the variables time of accident and body part affected are mostly related and the frequency of accidents among married and older workers is more than single and young workers. There was a higher frequency in the evening, night shifts and weekends. The results of this study are totally in line with the previous research.     

The Politics of Resistance: Informal banks in the Caribbean

Informal banks are as relevant as they were in slave times because they are creating financial alternatives for marginalized people. I explore this issue with an empirical study of 398 business people in the slums of Jamaica and Guyana. I use intersectionality theorizing to explain that poor women organize local banks as a form of contestation against the threat of violence, partisan and informal politics. Women from poor communities mobilize economic resources through mutual aid to resist dependence on corrupt political systems and exclusionary financial institutions. I argue that the banker ladies reorganize money markets for themselves and others. By organizing inclusive financial programs the banker ladies also build social capital through managing locally-based economic resources.     

Nonpoint Source Pollution Control under Incomplete and Costly Information

We analyze the efficient management of nonpoint source pollution (NPS) under a limited pollution control budget and incomplete information. We focus on the tradeoff between data collection and pollution abatement efforts by incorporating information acquisition into a NPS pollution control model. Comparative static results show conditions under which (i) a favorable change in the abatement costs at one source may lead to an increase in the treatment level at all sources, and vice versa, (ii) an increase in data collection cost leads to an increase in data collection level, and (iii) an increase in the efficiency of information acquisition leads to a decrease in the level of data collection. More importantly, the model simulations illustrate that acquiring and exploiting information on heterogeneity of sediment loading distributions across polluting sources leads to a more efficient budget allocation and hence a greater reduction in pollution damage than would be the case without such information.     

Existence of a Universal Comparative Statics Matrix for Differentiable Optimization Problems

A universal existence theorem is established that yields exhaustive and constraint-free comparative statics information for a general, differentiable optimization problem in the preferred form of a semidefinite matrix. It subsumes all comparative statics formulations of differentiable optimization problems. Its relationship to comparative statics methods extant is establishedWe are grateful to an anonymous referee for a particularly helpful comment on the contents of this paper.     

Jump Spillover in International Equity Markets

In this article we study jump spillover effects between a numberof country equity indexes. In order to identify the latent historicaljumps of each index, we use a Bayesian approach to estimatea jump-diffusion model on each index. We look at the simultaneousjump intensities of pairs of countries and the probabilitiesthat jumps in large countries cause jumps or unusually largereturns in other countries. In all cases, we find significantevidence of jump spillover. In addition, we find that jump spilloverseems to be particularly large between countries that belongto the same regions and have similar industry structures, whereas,interestingly, the sample correlations between the countrieshave difficulties in capturing the jump spillover effects.     

Erratum on “Optimal inventory control of empty containers in inland transportation system” [Int. J. Prod. Econ. 133(1) (2011) 451–457]

This paper points out some flaws in the simulation model presented by Yun et al. [2011. Optimal inventory control of empty containers in inland transportation system. International Journal of Production Economics 133 (1), 451–457]. Some of the formulae for inventory level and ordering quantity have errors which are corrected in this note.     

Persistence,seasonality and trend in the UK egg production

This paper discusses the time-series properties of UK egg production in order to provide an empirical analysis of the possible long-run impact of the shock on the industry following the recent incidence of salmonella poisoning. Our analysis shows that although the short-run properties of the UK egg production are consistent with the presence of persistent shocks, a shock duration is unlikely to have large long run efefcts. This result is remarkably robust to the choice of the persistence measure obtained.