Several factors can influence test-retest reliability:
- Time Interval: The time between the two test administrations can affect reliability. If the interval is too short, respondents may remember their previous answers, while too long an interval might introduce genuine changes in the measured attribute. - Test Conditions: Variations in testing conditions, such as different environments or instructions, can impact the results. - Respondent Factors: Changes in the respondent's health status, mood, or understanding of the questions can affect reliability. - Instrument Consistency: The inherent consistency of the measurement tool itself is a critical factor. Tools that are poorly designed or implemented will naturally exhibit lower reliability.
