How is the Kuder-Richardson (KR-20) coefficient expressed?

The Kuder-Richardson (KR-20) coefficient is expressed as a coefficient between 0 and 1. This measure is used to assess the internal consistency reliability of tests that have dichotomous choices, such as true/false or yes/no questions. A KR-20 value of 0 indicates no internal consistency, while a value of 1 reflects perfect internal consistency among the items on the test.

This range between 0 and 1 allows researchers and practitioners to easily interpret the reliability of their measurements. Higher values indicate greater reliability, while lower values suggest that the items may not be measuring the same underlying construct consistently.

Understanding this coefficient is crucial in nursing research, as it informs the quality of instruments used to measure patient outcomes, knowledge, and attitudes, thereby impacting the validity of research findings and clinical decisions.