I have data from two different years. The data is about the use of a drug, that is recorded in number of vials, that used to be an uncontrolled drug during the first year and then became controlled during the second year. I want to compare the difference in the drug use during these two time periods of the drug being uncontrolled and controlled. However, I also have other variables such as different types of diseases that the patients had which might be confounding with the amount of the drug used. I also have the different patient counts for each time period which might effect the amount of drug used.
I am thinking of using multiple linear regression for this analysis, however, not quiet sure of the coding part in SAS is it a prog reg or a proc glm? And do I need to combine my data from each year and indicate controlled/uncontrolled in a new column or should I analyze them separately?
I guess I understand how to look for confounding but need more help on how to compare two means while controlling for confounding...
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