ABSTRACT
To determine test-retest reliability, a test is administered to one group of examinees twice. Computing a correlation for the relationship between the two sets of scores indicates the stability of the scores over time. When a correlation is used to express the stability of test scores over time, the correlation is commonly referred to as a test-retest correlation or test-retest reliability or even as a reliability coefficient. Despite the different names, test-retest reliability is mathematically the same as a standard correlation. This chapter assesses the reliability of the Behavioral and Emotional Rating Scale–Second Edition (BERS-2): Parent Rating Scale (PRS). All parents of kindergarteners through to second graders at the elementary school and sixth graders at the middle school received by mail a copy of the PRS. Parents were informed that on receipt of the first protocol, a second PRS would be sent to them that was also to be filled out and returned.
