2. 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.
3. 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.
4. How Study Designs Differ
Number of observations
Exposure
Data Collection methods
Timing of Data collection
Unit of observation
Availability of subjects