Reliability

• Reliability

  The consistency of a measure
• Internal reliability

  The consistency of the measure within itself
• External reliability

  Consistency of a procedure on a different occassion
• Inter-observer reliability

  2 or more observers watch the same situation. If reliable, then the records should match.
• Test-retest procedure

  Two tests of the same type given to the same pps should show similar results (e.g. questionnaire)
• Split-half procedure

  Divide pps score in half. If reliable, scores on both halves should correlate.
• Equivalent forms

  Test done twice( with same pps). If the results correlate then it is reliable (often used in self-reports)