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Applying spatial regression to evaluate risk factors for microbiological contamination of urban groundwater sources in Juba, South Sudan
Hydrogeology Journal 25(4) pp. 1077-1091, doi: 10.1007/s10040-016-1504-x Abstract This study developed methodology for statistically assessing groundwater contamination mechanisms. It focused on microbiahumanitarian aid organisation Médecins Sans Frontières in 2010. The factors included hydrogeological settings, land use and socio-economic characteristics. The results showed that the residuals of a conventional probit regression model had a significant positive spatial autocorrelation (Moran’s I =3.05, I-stat = 9.28); therefore, a spatial model was developed that had better goodness-of-fit to the observations. The mostsignificant factor in this model (p-value 0.005) was the distance from a water source to the nearest Tukul area, an area with informal settlements that lack sanitation services. It is thus recommended that future remediation and monitoring efforts in the city be concentrated in such low-income regions. The spatial model differed from the conventional approach: in contrast with the latter case, lowland topography was not significant at the 5% level, as the p-value was 0.074 in the spatial model and 0.040 in the traditional model. This study showed that statistical risk-factor assessments of groundwater contamination need to consider spatial interactions when the water sources are located close to each other. Future studies might further investigate the cut-off distance that reflects spatial autocorrelation. Particularly, these results advise research on urban groundwater quality.
Equality of opportunity and the precarization of labour markets
European Journal of Political Theory, DOI: 10.1177/1474885117738116 Abstract How can we equalize opportunities while respecting people’s freedom? According to a view that I call libertarian resourcism, pbecome a powerful weapon to criticize work conditionality as unfair and perfectionistic (or illiberal), and to motivate political struggles for the emancipation of the precariat. However, similar views are also expressed in many other justifications of basic income that stress the strategic importance of exit-based empowerment. This article argues that the reliance of these theories on concepts and assumptions of libertarianism makesthem ill-equipped to justify core requirements of social empowerment, and to identify the forms of agency needed to sustainably advance the radical objectives they favour. The implication of this is not to reject the link between social justice and unconditional resource endowments but to dissociate the justification and design of such measures from libertarian ways of thinking.
