testiretestiarviointi
Testiretestiarviointi, also known as test-retest reliability, is a statistical measure used to assess the consistency of a measurement tool or instrument over time. It involves administering the same test or assessment to the same group of individuals on two or more separate occasions under similar conditions. The results from these repeated administrations are then compared to determine the degree of agreement. A high test-retest reliability indicates that the instrument yields similar results when administered repeatedly, suggesting that the scores are stable and not unduly influenced by random error or fluctuations in the testing situation. Conversely, low test-retest reliability suggests that the instrument is not consistent and its scores may vary significantly between administrations. This can be problematic as it makes it difficult to draw reliable conclusions or make comparisons based on the measurements.
The process typically involves selecting a representative sample of participants, administering the instrument, waiting for an