Reliability, validity, generalizability and credibility

Reliability, validity, generalizability and credibility

1. Reliability

   • subject error
     • subject bias
       • observer error and bias
       • (try to please researcher)
     • (different results on different days)

2. Validity

   • internal validity
     • 1. History
       • Things that have changed in the participants environments other than those forming a direct part of the enquiry.
         • 2. Testing
           • Changes occurring as a result of practice and experience gained by partcipants on any pre-test.
             • 3. Instrumentation
               • Some aspect of the way participants were measured changed btw pre-tests and post-tests.
                 • 4. Regression
                   • If participants are chosen because they are unusual or atypical. later testing will tend to give less unusual scores

3. Generalizability

   • external validity
     • selection
       • (specific to group)
         • setting
           • (specific to setting)
             • history
               • (particular past experience)
                 • construct effects

4. Credibility

   • research needs to be assess