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).
The data we are trying to code has an inherent order, but the coding in this example does not follow that order. This is not appropriate coding for an ordinal categorical vari-able. For a nominal categorical variable, however, the order makes no difference. Although we code each category with a number, the number does not represent a numeri-cal ...
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