Validity refers to whether a measure actually measures what it claims to be measuring. Some key types of validity are explored below. Show
Face validityFace validity is a measure of whether it looks subjectively promising that a tool measures what it's supposed to
Internal validityInternal validity is a measure of whether results obtained are solely affected by changes in the variable being manipulated (i.e. by the independent variable) in a cause-and-effect relationship. Two key types of internal validity are:
Internal validity can be assessed based on whether extraneous (i.e. unwanted) variables that could also affect results are successfully controlled or eliminated; the greater the control of such variables, the greater the confidence that a cause and effect relevant to the construct being investigated can be found. External ValidityExternal validity is a measure of whether data can be generalised to other situations outside of the research environment they were originally gathered in. Two key types of external validity are:
The external validity of an experiment can be assessed and improved by replicating a study at different times and places, and obtaining similar results. For example, confidence in the generalisability [and in turn external validity] of results is increased when research is successfully replicated across different cultures. Chapter 4.
2. What is construct validity and how do you test for it? Give an example.
3. What are the consequences of a lack of construct validity? Give an example to illustrate your answer.
4. What is it about construct validity that makes it more difficult to assess than the other types of validity?
5. What is the difference between construct validity and predictive validity? What would the consequences be if you confused the two and thought you had construct validity when you only had predictive validity?
6. What is the difference between random error and systematic error?
7. What is the difference between the reliability of a measurement and its accuracy?
8. Why is the multiple methods, multiple measures approach used to assess construct validity?
9. What is the difference between the accuracy and the validity of a measurement? 30-33
10. A professor is studying learning and academic performance and uses GPA as a measure of how much her students have learned. Discuss why (or why not) this is a valid measure how much her students have learned.
What is the type of validity that is achieved when a measure measures what it is presumed to measure?Validity , often called construct validity, refers to the extent to which a measure adequately represents the underlying construct that it is supposed to measure.
What is the validity of measurements?Validity refers to how accurately a method measures what it is intended to measure. If research has high validity, that means it produces results that correspond to real properties, characteristics, and variations in the physical or social world. High reliability is one indicator that a measurement is valid.
Is the type of validity that exists when an inspection of the items used to measure a concept suggests that they are appropriate on their face?The type of validity that exists when an inspection of the items used to measure a concept suggests that they are appropriate "on their face". We can say that a measure has face validity if it is obviously pertains to the concept being measured more than to other concepts.
What are the 3 main types of measurement validity?Here we consider three basic kinds: face validity, content validity, and criterion validity.
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