Nominal data consists of categorical data without numerical meaning or order (e.g., types of diagnoses, patient genders). When analyzing nominal data, the appropriate statistical method is to count the frequency of occurrences in each category. A bar chart is a visual tool used to display these frequencies, where each bar represents a category, and the height of the bar indicates the number of occurrences (frequency) in that category. This aligns with NAHQ’s emphasis on selecting appropriate data visualization tools for specific data types in health data analytics. Ratios (A), distributions (C), and correlations (D) are not typically visualized with bar charts for nominal data.
NAHQ CPHQ Study Guide, Health Data Analytics Section, “Data Types and Visualization Techniques”; NAHQ CPHQ Practice Exam, Statistical Analysis Principles.
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