Transcription of Data Analysis Basics: Variables and Distribution
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Data Analysis Basics: Variables and Distribution
North Carolina Center for Public Health Preparedness The North Carolina Institute for Public Health Data Analysis basics : Variables and Distribution VOLUME 3, ISSUE 5 How do you know whether a chemi-cal spill in a factory caused illness in the workers? How do you know what food caused an outbreak of salmo-nella in your community? In a field investigation, you often want to know whether a particular exposure ( , a chemical spill) is associated with any possible illness, or which of many possible expo-sures is associated with a particular illness ( , what was the potential cause of an outbreak of salmonella). You start the process of answering these questions by choosing a study design, developing a questionnaire, and gathering data in the field.
age in years, weight, blood pressure readings, indoor and outdoor tem-perature, concentrations of pollutants in the air or water, and other measure-ments. Categorical variables contain informa-tion that can be sorted into catego-ries, rather like sorting information into bins. Every piece of information belongs in one—and only one—bin.
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