Great job on your post! You explained the assessment of validity very well and how each one of them has a function that is important to measure what they intend to measure. The test-retest reliability is a method for testing on large groups on two different occasions. If the results are consistent then it’s reliable. I agree that without being reliable it cannot be valid and that is for any type of research study. If you were working on a study for depression, to see if an individual who stays inside mostly is prone to be more depressed. Do you think you can try the method of test-retest reliability?
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