[Pay for Essay] – Discuss on Models of Validity in Psychology Testing

175 word minimum per response/feedback

First Discussion

As there are three categories to validity, specialists use these to evaluate the level during a test. Content validity is determined by an evaluation of subjects within a test. It provides a sense of whether the samples are properly designed for the test. Criterion-related validity is a measure gathered by evaluating a relationship between scores of one test to those of another. This is utilized for individual purposes in judgment on test ranking (Cohen, 2018). Construct validity is analyzing two aspects, with the first being how test scores from one relate to others. The second aspect is the understanding of test scores.

  • Compare and contrast these two models in terms of how they conceptualize validity.

The approaches to validity are not mutually exclusive. While the Trinitarian approach to validity is also known as the classic view, it utilizes the 3 concepts of content, criterion-related, and construct, within tests. On the other hand, Messick wanted to use the unitary view of validity. This is because it would take everything into account to determine whether a test was reasonable. He mentions that validity is a “social value” as it possess meaning when decisions are made (Messick, 1995). Further, there are two sources of invalidity. Contrast underrepresentation being that the assessment is too narrow, and construct-irrelevant variance meaning the assessment is too broad. With these sources, the assessments may not include important dimensions or they may include too much information.

  • Identify at least one advantage and disadvantage of each model.

The unitary view takes everything into account when determining validity, which I would consider a disadvantage. However, everything is not important if nothing is important. With this, the test developers would decide what the main goal is to achieve. The sources of invalidity would take part because there needs to be a medium in what the assessment is to measure. These sources I would consider an advantage to provide insight.

Numbers are crucial when assessments are being done, as the goal is to determine a coefficient value. This, I would consider an advantage in the Trinitarian view because the values can be ranked to conclude which category of validity needs to be improved.

  • Decide which model appears to be the most valid for determining validity of a test.

Utilizing this unit’s readings, Guion’s Trinitarian view seems more accurate for figuring the validity of a test. This is because validity has a coefficient, in which numbers are involved. As Guion mentions, the numbers obtained show magnitude of validity (1980).

  • Explain your decision in terms of the implications for decision making about a test’s validity.

The interpretation of the score on an assessment correlated with the actions caused by what is interpreted, also needs to be valid (Messick, 1995). When creating an assessment, the developer not only needs to decide what the test will evaluate, but what the goal will be that the test will result in. Deciding on whether the test is valid must match whether the results are what the developer wanted. If the test is not valid and the coefficient is low, there may be some changes to be made, and vice versa. After all, validity is an estimate of how well a test measures in a certain context (Cohen, 2018).

Second Discussion

  • Compare and contrast these two models in terms of how they conceptualize validity.

The Trinitarian Model of Validity has three categories, Content Validity, Criterion Validity, and Construct Validity. (Guidon, 1980) In order for this test to be proven valid, all three categories must also be valid.

The Unitary Model of Validity evolved from the Trinitarian Model, therefore there are some similarities. (Ghaderi, 2018) This model consists of “unifying” content, criterion, and consequences that could all be wrapped under one umbrella. This would test not only validity but also social values that are apart of the interpretation of tests. (Ghaderi, 2018).

  • Identify at least one advantage and disadvantage of each model.

One disadvantage to Trinitarian model is that validity is determined by whether or not all three categories are valid. On the opposite end, This is also an advantage because a test that is validated with such arduous requirements is much easier proved to be valid. (Cohen & Swerdlik, 2017)

Much like Trinitarian Model, A disadvantage to the unitary model is the need for validity across the board, encompassing content, substantiate errors, structural, generalization, external, and consequential as all needing to be proven valid. (Messik, 1995). The advantage to this model, however, is that the validity of the test is looked at in a more comprehensive way.

  • Decide which model appears to be the most valid for determining validity of a test.

Based on the amount of criteria required to determine validity, I believe the unitary model is the most valid model.

  • Explain your decision in terms of the implications for decision making about a test’s validity.

I believe the Unitary model is the most valid for determining validity because it brings a strong argument of validity with so many subcategories that must be proven valid in order for the test to be validated as a whole.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes:

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>