(Data file: salary gov) and 6.11. The data as given have as its unit of analysis the job class. In a study of the dependence of maximum salary on skill, one might prefer to have the employee as the...

(Data file: salary gov) and 6.11.

The data as given have as its unit of analysis the job class. In a study of the dependence of maximum salary on skill, one might prefer to have the employee as the unit of analysis. Explain why changing the unit of analysis to the employee rather than the job class would suggest using wls. What are the relevant weights?

But use wls. Do any conclusions change?