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Study Design
Dr. Mohabbat Ali
Study design: Definition
A study design is a specific plan or protocol for
conducting the study, which allows the investigator to
translate the conceptual hypothesis into an operational
one.
Study Designs
 A framework, or the set of methods and procedures
used to collect and analyze data on variables
specified in a particular research problem.
 Many types, each with its advantages and limitations.
How Study Designs Differ
 Number of observations
 Exposure
 Data Collection methods
 Timing of Data collection
 Unit of observation
 Availability of subjects
Choice of Design
Depends on:
 Research Questions
 Research Goals
 Researcher Skills
 Time and Funds
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