MEASUREMENT CONCEPTS 4
Psychometricsrefers to the field of study that deals with psychologicalmeasurement theory and technique. It is comprised of measurement ofissues personality traits, knowledge, attitudes, and abilities.Reliability and validity are the most important concepts inpsychometrics. Reliable measures always maintain consistency inwhatever item is being measured while a valid measure determines theitem that should be measured. It is the aim of this paper to provideexamples of reliability and validity of measures, why they areimportant and how test designers can tackle the challenge.
Itis possible that a reliable measure can be consistent but fail to bevalid. For instance, if your weighing scale is off 4lbs, the scalecan be termed as being reliable since it gives a consistent report onthe same weight every day. The scale is not valid since it adds 4lbsto the true weight and hence it is not a valid measure of weight.  Another example can be in the form of broken that every timeunder-measure length by the same amount consistently even though theresulting length is still invalid.
Differencesin reliability and validity of measures occur as a result of varyingconditions and tools used to conduct the tests. Conducting measuresshould pay close attention to how the tests are carried out as itplays a critical role in shaping the outcome of the measures. Whenusing test scores in making correct inferences in relation to a givenpsychological issue, the scores must be both reliable and valid.Measuring a given trait consistently is not enough to guarantee thatthe measurement is valid (Rust, Golombok, Kosinski & Stillwell,2014). Nevertheless, no matter the form that test scores take, themost critical point of concern is the manner in which results areused and how they impact the society.  In particular, a testused for admitting students to certain programs or to schools doesnot only have an effect on the individuals but also assigns values tothe type of content getting tested. There is a possibility that aperfectly appropriate test in one situation may be whollyinsufficient or inappropriate in another situation. For instance,sufficient test that can be used in the diagnosis of educationalneeds may be insufficient when determining the levels of graduationfrom school.
Inorder to successfully determine the validity of a test, a focusedstudy should be based on the specific test results setting. Thetests` use can be evaluated separately depending on where they aregoing to be used. This is pegged on the premise that test validity isthe ability to validate the use of a test in any given context suchas admission into the school. Potential challenges exist in ensuringconsistent testing environment and this requires a solid rationalefor including certain measures in the psychological issue beingexamined (Coaley, 2014).
Testdesigners need to employ certain intervention mechanisms to improvevalidity.  First, test designers should ensure that their goalsand objectives are categorically distinct and operational with clearspecification of the expectations. Second, test designers shouldmatch the assessment measures to the goals and objectives and theyshould be ready to have the tests reviewed to obtain importantfeedback. The third mechanism is to get the participants involved andhave them look over the measures to establish any technicalchallenges. Finally, test designers should be ready to compare theirmeasures with any other existing measures or any available data. Allthe above can be accomplished if the test designer establishesreliable judgmental, procedural, logical and empirical evidence.
Coaley,K. (2014). Anintroduction to psychological assessment and psychometrics.Sage.
Rust,J., Golombok, S., Kosinski, M., & Stillwell, D. (2014). Modernpsychometrics: The science
No related posts.