Alternate forms
reliability. A procedure for obtaining
evidence of the reliability of test scores by calculating a reliability
coefficient from scores produced by two or more forms of the same test. This is
also known as Equivalent Forms Reliability. When there are two forms, the term
Parallel Forms is sometimes used.
Alpha has more than one meaning in psychology.
In research methods, alpha is the probability of rejecting a true null hypothesis. Alpha is often set at .05 in psychological studies.
Alpha is also short for Cronbach's alpha, which is also called Coefficient alpha, which is a value that describes the degree of internal consistency among the items in a test or questionnaire. Some authors use the Greek letter for alpha (a).