Ten cities have volunteered for the comparative study in math since the exam was first given in 2003.
In the comparative study of the cost of mass transit, analysts at Mercer selected the most convenient and popular means of transportation between bus and subway in a given city and gauged the price based upon a ride in the city center for one adult, according to the Mercer analysis team.
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The Third International Mathematics and Science Study (TIMSS) was the most ambitious comparative study ever conducted.
As the study points out, numerous comparative studies of organic and conventional yields have already been conducted with conflicting results.
CNN: Study: Organic yields 25% lower than conventional farming
"The Impact of Urbanization on Biosphere Reserves: A Comparative Study of Protected and Non-Protected Coastal Areas".
UNESCO: Informes de las Becas MAB - (MAB Young Scientists Awards)
Originally the San Francisco researchers had hoped to do a comparative study of different agencies' programmes, but for this project only Compassion chose to take part.
For example, a comparative study of results before and after the defeat by Brazil could provide experts with incontrovertible proof of whether there is a "feel-good" factor involved in exam performance.
"Online you can study the product, ask questions anonymously and do comparative shopping, all while you are listening to music, watching TV or having a quick break at work, " says Langmead.
They could not handle the amount of data that he wanted to analyze for his dissertation, which was part of a comparative study based on surveys in seven nations.
Furthermore, the study will explore the contents of textbooks in several regions of the world in order to analyse in a comparative perspective the different representations of the Holocaust and how it is actually taught to pupils and students.
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