I am sure the title might be confusing, but here is what I am dealing with:
I am running a survey at a health care center. The health center has around 15k active visitors. There are 5 departments operating in the center
Patients may (and in fact) visit more than one department.
First, we calculated the sample size needed for a level of precision and confidence level (typically 5% and 95% respectively) for an overall percentage of satisfied patients.
The problem I am facing is how to distribute the resulting sample size among the 5 departments. I was hoping for a stratified random sampling but clearly, the strata are overlapping.
At first, I thought of the capacity of each department with respect to, let's say, number of examinations, but I am not so sure about that.
I have the number of unique patients that visited each department in a given period of time (i.e. 6 months) and also the number of examinations or visits to each department. Again, some patients visit more than one department
How should I go about this issue?
- Should I use some kind of stratified sampling?
- In what way?
Any help would be greatly appreciated