The statistical data collected may be for profile or prospective studies at local, state, national or international level. They are analyzed to assess changes in health or disease situations in the community or population by standard parameters. The statistical data obtained from the above sources can be divided into two broad categories: Qualitative and Quantitative.

This topic covers: Qualitative (or Discrete) Data, Quantitative (or Continuous) Data, Methods of presentation: Tabulation and Drawing. Frequency distribution table or frequency table, Rules for making a frequency distribution table, Frequency Distribution Diagrams.

Types of data distribution

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