Discussion:
Levels of Measurement and Concepts of Validity
Selecting a method to accurately measure variables can be a complex task. Some data can be transformed from one level of measurement to another, and other data cannot. Measurement instruments must also be validated to prove they accurately measure the variables in question. Consider the measurement of data and compare measurement validity to the concept of design validity.
To prepare for this Discussion:
1. What is an example of data that can be transformed from one level of measurement to another and another example of data that cannot be transformed?
2. Why is validity for measurement so difficult to establish?
3. How are the concepts of validity for design and for measurement similar and different?
4. What is the relationship between reliability and validity?
Post a response:
1. One paragraph in which you differentiate between the levels of measurement by providing an example of data that can be transformed from one level of measurement to another.
2. Another example of data that cannot be transformed.
3. Include an explanation for why some data can be transformed and some cannot.
4. Two paragraphs comparing the concept of validity for design to the concept of validity for measurement.