categorical data

How is Categorical Data Collected?

Categorical data can be collected through various methods such as:
1. Surveys and Questionnaires: Often used to gather information on demographic characteristics, health behaviors, and exposure to risk factors.
2. Medical Records: Provide detailed health information including disease status, treatment, and outcomes.
3. Epidemiological Studies: Such as cohort studies, case-control studies, and cross-sectional studies that collect data on exposure and disease status.

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