Mark Wheeler's Focus article, "Measuring Mercury" (1), which appeared in the August 1996 issue of EHP, contained a serious omission. Wheeler concentrated on methyl mercury and, to a lesser extent, elemental mercury in dental amalgams. He failed to mention the relatively recently described but extremely significant exposures to elemental mercury in ethnically Hispanic and Caribbean homes, conseq...

Modern approaches to political measurement have generally ignored the importance of out-of-sample predictive performance. This is problematic for two reasons: first, many of the abstractions scholars attempt to proxy for are themselves expectations; and second, the resulting measures are prone to overfitting. We advocate a data-driven approach to measurement based on the train-validate-test par...

This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract Four years (2010–2013) of observations with polarization lidar and sun/sky photometer at the combined European Aerosol Research Lidar Network (EARLINET) and Aerosol Robotic Network (AERONET) site of Limassol (34.7 • N...

We study integral ratios of hook products of quotient partitions. This question is motivated by an analogous question in number theory concerning integral factorial ratios. We prove an analogue of a theorem of Landau that already applied in the factorial case. Under the additional condition that the ratio has one more factor on the denominator than the numerator, we provide a complete classific...

background and objectives: a single reactive igg anti-dengue virus elisa test in the absence of igm antibodies or ns1 antigen may denote current infection or past exposure to the virus. to determine whether igg index value can be used to identify true current dengue infection we conducted a prospective observational study. materials and methods: suspected dengue patients (n =1745) were tested i...