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
The simple answer to this question is that correlation is the standardized form of covariance. Both Correlation and Covariance describe the degree of similarity between two variables. Correlation: When you say that two items correlate, you are saying that the change in one item effects a change in another item. You will always talk about […]
arnold on Sep 17, 2008