Why do people confuse reliability and validity?

Validity concerns the test’s ability to measure what it is intended to measure. Meanwhile, reliability concerns the degree of consistency in the results if we repeat the test over and over.

How are validity and reliability related?

Reliability and validity are concepts used to evaluate the quality of research. They indicate how well a method, technique or test measures something. Reliability is about the consistency of a measure, and validity is about the accuracy of a measure.

What is reliability validity and utility?

The concepts of reliability, validity, and utility are most commonly used as important elements and techniques which help with the development of measurement scales and instruments for various social, scientific, psychological, and marketing researches. Reliability alludes to the consistency of a measurement.

Can there be reliability without validity?

“Without reliability, there is no validity.” Many of us who develop and use educational assessments were taught to take this maxim for granted as a fundamental principle of sound measurement. Theoretically, reliability is defined as “the degree to which test scores are free from errors of measurement….

What is the validity of the CPT test?

Barkley (1991) observed that although CPTs present excellent face validity (measure the ability to sustain attention for an extended period of time), their psychometric validity are often low to moderate. However, psychometric properties of CPT vary considerably between different tests.

How can you tell the difference between reliability and validity?

Reliability can be estimated by comparing different versions of the same measurement. Validity is harder to assess, but it can be estimated by comparing the results to other relevant data or theory. Methods of estimating reliability and validity are usually split up into different types.

Why are continuous performance test ( CPT ) still controversial?

Despite the popularity of continuous performance tests (CPT) in supporting the diagnostic procedure of attention-deficit hyperactivity disorder (ADHD), these measures are still controversial mainly due to limited sensitivity, specificity, and ecological validity.

How is the validity of the Conners CPT 3 determined?

Another approach in establishing the Conners CPT 3’s validity is to show how it works together with other measures of similar constructs in the assessment of attention problems. To assess such validity, samples were collected in which cases were scored on the Conners CPT 3 and another measure of attention.