Reliability of Assessments

In this video I explain the difference between validity and reliability and then describe several ways of assessing reliability including split-half reliability, test-retest reliability, equivalent-form reliability, and the related concept of standardization. Don’t forget to subscribe to the channel to see future videos! Have questions or topics you’d like to see covered in a future video? Let me know by … Read More

Assessing Assessments – Types of Validity

In this video I explain how we assess the validity of assessments that have been created for a particular property (such as intelligence). There are several types of validity that can be assessed including construct validity, face validity, content validity, and criterion-related validity (concurrent and predictive). I briefly describe each of these types of validity and how they tell us … Read More

Assessing Intelligence

In this video I introduce psychometrics, the study and design of testing for traits and abilities. I describe the difference between power tests and speed tests for assessing intelligence and the importance of differentiating people in order to have a worthwhile test. Next I describe the difference between an achievement test and an aptitude test and how this relates to … Read More

Types of Test Designs

In designing an intelligence assessment, I may want to know the level of difficulty that someone is capable of solving. In this case, I would probably look at whether a person is able to solve a particularly difficult puzzle or not. This would be considered a power test. In this context power refers to how well a measurement can differentiate … Read More