Abstract Background In causal analyses, some third factor may distort the relationship between the exposure and the outcome variables under study, which gives spurious results.In this case, treatment groups and control groups that receive and do not receive the exposure are different from one another in Roller Skate Parts some other essential varia
Land subsidence induced by excessive groundwater withdrawal has been a major environmental and geological problem in the Beijing plain area.The monitoring network of land subsidence in Beijing has been established since 2002 and has covered the entire plain area by the end of 2008.Based on data from extensometers Honey and groundwater observation w
Science, Technology, Engineering and Mathematics (STEM) education is a strong case of a multidisciplinary teaching and learning process, apt for transforming the conventional instructor based courses into ones, where the syllabus focus is on problem solving and discovering exploratory learning.In this context the adoption of the Community of Practi
In this paper, the differences between two variations of proportional representation (PR), open-list PR and closed-list PR, are analyzed in terms of their ability to accurately reflect voter preference.The single nontransferable vote (SNTV) is also included in the comparison as a benchmark.We construct a model Insect Repellant of voting equilibria