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Validity of an evaluation (test): Types of validity and methodsBY: Deena David | Category: Education | Post Date: 2009-07-20
Validity is an important part of a test. Validity of the evaluation method is necessary to universally accept that the test is good. Validity is the appropriateness of the interpretations made from the test score and other evaluation results. A test is said to be valid if it measures what it is said to measure. Validity is very important in science. Various research are undertaken to establish the validity of tools. These tools may be used to measure varied things. Types of validity: There are various types of validities like content validity, predictive validity and construct validity. These are explained in detail. 1. Content validity: This is a measure of the degree to which a test contains a representative sample of the materials taught in a particular course. 2. Predictive validity or Criterion related validity: Criterion related validation can be defined as the process of determining the extent to which a particular performance is related to other valued measures of performance. Some external criteria are necessary to determine the validity of the test. 3. Construct validity: This is concerned with the extent to which a test performance can be deciphered as a measure of a particular characteristic or quality. In content validity and predictive validity, the focus is on how well a test represents achievement. In contrast, construct validity is used to measure something that is not tangible. Here, the test is examined by asking a question as to how well the test score represents to the trait that it was supposed to measure. Methods of improving the validity of a tool or test: 1. Carefully matching the test with learning objectives and teaching methods. This will help in achieving a high validity. If the evaluation does not cover the necessary subjects, then the test or evaluation will not be valid. 2. Increasing the sample of objectives and content areas that are included in a given test. 3. Using methods that are appropriate for the objectives specified will increase the validity. This is because the methods will be specific and to the point. If the method is vague, then the validity will decrease. 4. Improving the reliability will in turn increase the validity. This is because both validity and reliability are dependent on each other for a test to be perfect. An evaluation has to be both valid and reliable to be used again and again without any change ion the outcome under standard conditions. These are the methods by which the validity of a test can be improved. Article Source: http://www.saching.com About Author / Additional Info: I am a Masters Degree holder in Pediatric Nursing. I also do freelance writing work. I am also interested in technology and computer applications. Comments on the article can be sent to deenaanddavid@gmail.com Additional Articles: * The Satyam Saga: The unanswered questions * Is philosophy just an armchair theory? * Health benefits of fish oil: Good for Heart, Hair, Brain & Arthritis * Television: Harmful Effects in Social life * BIG AS YOU THINK Does this article violate or infringe on your copyright ? It is a violation of our terms for authors to submit content which they did not write and claim it as their own. If this article infringes on your copyrights, then use our Contact us form with the detailed proof of infringement along with the offending article's title, URL and writer name. If you do not hear back from us then contact us again in another 10 days. Thank you. Comments on this article: (0 comments so far) * Additional comments are now closed for this article *
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