Starting from the beginning, measurements of an observable behavior are taken and the test developer draws an inference about the amount of the theoretical construct that characterizes an individual. A construct provides an efficient and convenient method for labeling a number of similar behaviors. Through the use of constructs, the observer can begin to classify […]
arnold on Oct 05, 2008
Watch this video: If you are only looking for the predefined expectation, you might miss the unexpected!
arnold on Oct 04, 2008
Explain reliability in terms of classical test theory: Nunnally (1967) defined reliability as “the extent to which [measurements] are repeatable and that any random influence which tends to make measurements different from occasion to occasion is a source of measurement error” (p. 206). There are many factors can prevent measurements from being repeated perfectly. Crocker […]
arnold on Sep 28, 2008
1) The mean of the error scores for a population of examinees is zero. 2) The correlation between true and error scores for a population of examinees is zero. 3) When examinees take two seperate tests and each examinee’s score on the two tests (or two testing occasions with the same form) are assumed to […]
arnold on Sep 17, 2008