Improving Reliability

• What is reliability?

  Something consistent
• What is test-retest?

  • Testing the same person twice to test reliability
  • The two sets of scores are correlated
  • The correlation co-efficient needs to exceed +0.80 to be considered reliable
• What is inter-observer reliability?

  • Comparing observations from two observers
  • The scores are correlated and should exceed the correlation co-efficient of +0.80 to be considered reliable