The relationship between the two conceptsThis research might include: concept analysis, expert validation, clinical validation, instrument development, larger studies, powerful statistical analyses.Reliability and Validity. The second measure of quality in a quantitative study is reliability, or the accuracy of an instrument. For example, a survey designed to explore depression but which actually measures anxiety would not be considered valid.
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Differences between reliability and validityAlthough these two psychometric properties are closely related, the truth is that they refer to clearly differentiated aspects. Finally, concept validity is intended determine if the test measures what it intends to measure, For example of convergence with scores obtained in similar tests. The instrument must include all the fundamental aspects of construction for example, if we are to do an appropriate test to measure depression, we will necessarily have to include items that assess mood and decrease in pleasure.Criterion validity measures the ability of the instrument to predict aspects related to the plan or area of interest. We can basically distinguish between content validity, criteria (or empirical) validity and concept validity.Content validity defines the extent to which the items in a psychometric test are a representative sample of the items that make up the concept to be assessed. This concept is defined as the relationship between the score obtained on a test and another related measure the degree of linear correlation between the two elements determines the coefficient of validity.Likewise, in scientific research, a high validity indicates the extent to which the results obtained with a given instrument or in a study can be generalized.There are different types of validity, which depend on how it is calculated this makes it a term with very different meanings.
The most commonly used procedure is the two-half procedure, in which the items are divided into two groups after the test is answered then the correlation between the two halves is analyzed.The method of parallel or alternative forms consists in creating two equivalent tests to measure the degree of correlation between the items. The way they are calculatedIn order to measure reliability, three procedures are used basically: the method of two halves, that of parallel shapes and the test-retest. The information they provideAlthough this is a somewhat simplistic way of approaching it, it is generally claimed that validity indicates that a psychometric tool actually measures the construct it seeks to measure, while reliability refers to know if it is measured correctly, without errors. On the other hand, the validity does not refer exactly to the instrument but to generalizations made from the results obtained through this. The object of the analysisReliability is a characteristic of the instrument, in that it measures the properties of the elements that compose it.
The relationship between the two conceptsThe reliability of a psychometric instrument influences its validity: the more reliable it is, the greater its validity will also be. Likewise, the validity of content is often determined by rational analysis, not statistical analysis for example, it includes face validity, which refers to the subjective judgment of experts on the validity of the test. The two procedures can be combined, resulting in the test-retest with parallel forms, which consists in leaving a time interval between the first form of the test and the second.For its part, the validity it is calculated in different ways depending on the typeBut in general, all methods are based on comparing the score of the objective test with other data from the same subjects with respect to similar traits the aim is for the test to act as a predictor of the shot.Among the methods used to assess validity are factor analysis and the multi-method-multirash feature matrix technique.
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