Reliability, validity, generalizability and credibility.

Reliability, validity, generalizability and credibility.

1. Shipman’s 4 key questions about the quality of research

   • RELIABILITY
     • If the investigation had been carried out again by different researchers using the same methods, would the same results have been obtained?
       • Subject error (different results on different days) Subject bias (try to please researcher) Observer error and bias.

2. VALIDITY

   • Question 2. Does the evidence reflect the reality under investigation? Has the researcher found out what he/she thinks or claims it’s about?
     • Posible threats to internal validity.
       • 1. History.
       • 2. Testing
       • 3. Instrumentation.
       • 4. Regression.

3. GENERALIZABILITY

   • Selection (specifici to group) Setting (specific to setting) History (particular past experience) Construct effects. (only this group has these constructs)

4. CREDIBILITY.

   • Question 4. Is there suficiente detail on the way the evidence was produced for the credibility of the research to be assessed?