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. In this Discussion, you will consider the measurement of data and compare measurement validity to the concept of design validity, introduced in Week 2.
To prepare for this Discussion:
- Review Chapter 7, "Measurement," and Appendix C in the course text Research Methods in the Social Sciences.
- 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?
- Why is validity for measurement so difficult to establish?
- How are the concepts of validity for design and for measurement similar and different?
- What is the relationship between reliability and validity?
With these thoughts in mind:
Post a 3-paragraph response:
- 1 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, and another example of data that cannot be transformed. Include an explanation for why some data can be transformed and some cannot.
- 2 paragraphs comparing the concept of validity for design to the concept of validity for measurement.
When appropriate, be sure to support your postings and responses with specific references to the reading(s) and/or video program(s) and use APA format.