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The Sum statement is closely related to RETAIN. It allows one to calculate a cumulative sum over the observations in a data set. Many statistics and other quantities that arise in statistical…
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The RETAIN statement allows SAS to access the previous observation when processing the current observation. Given that SAS' built-in loop normally prevents such access, knowing the RETAIN…
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This video provides a historical overview of the conflict between Israel and its neighbors.
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This video examines three criticisms of the current international economic system: (1) the system disadvantages the developing states, (2) the U.S. does not always follow the rules it helped create…
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