validity

• what is internal validity ?

  extent to which results of the study are due to the tested variable rather than extraneous ones
• what is external validity ?

  the extent to which the results can be generalised to other people and settings
• what are the 4 ways of improving validity ?

  face, concurrent, predictive, temporal
• what is face validity ?


  most basic assessment, do the tests test what it claims to
• what is concurrent validity ?

  uses already validated measures for the variables being tested and correlates the measure from one test with the measures using another
• what is predictive validity ?


  checks validt by assessing how well it predicts future behaviour e.g iq on school behaviour
• what is temporal validity ?


  compares results over time by retesting - if finding sr the same the tests is valid
• how do you improve internal validity ?

  employ tighter controls on extraneous variables and by ensuring high levels of reliability in the procedure and the measurement
• how do you improve external validity ?

  develop realistic tests and using natural setting for studies instead od artificial tests in highly controlled conditions