Examining the internal and external threats to validity. Can you help me identify and define those threats that are related to measurement, and the threats that are related to sampling issues.
Threats to measurements: single operation bias or only doing one test for one measurement. This tends to limit the outcomes to that single instance and might not cover the entire picture of the research. A simple example: the person is sneezing so they must have a cold. We know there are lots of reasons for sneezing and a single instance will not provide a clear reason for the sneezing. Another ...
The solution provides advise in relation to threats against the the internal and external validity of the research process in relation to measurement and sampling.