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In the world of clinical research, laboratory data yields some of the largest and most unwieldy data sets SAS programmers encounter in a project. Lab data usually is collected both on data collection forms (case report forms), and in an electronic format, such as a spreadsheet or text file straight from the lab. Extensive data manipulation is almost always required in order to get the data into a format that is useful for analysis, and to combine the other collected data with the data from labs correctly. These facts about lab data also mean that the odds of making a critical programming error are greatly increased.
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