How to pass a value from dashboard to variable definition?

[#1]

Hi experts,

          I would like to pass a value from a user defined list box of the dashbouard to a variable definition in order to avoid designing multiple charts with only one parameter different. For example, I have a variable defined as count({$<Metric={1}, Intervention={0} >}HospitalAccountID), I hope I can pass different values obtained from list in the dashboard to Metrics such as CXR, Readmission, orderSet. In this way, I only need ONE chart instead of THREE charts on the dashboard.

Is this passible? Thanks

Longmatch.

[#2]

Jason,

         Do you have time to look at my sample? Any ideas?

Thanks

Longmatch

[Jason_Michaelides]

Here you go.

[#4]

Thank you very very much. This feature cannot be added into my project without your helps. You are genius!!!

I do have a question for you. It looks like that the value selected in list box cannot be passed to variable directly- testVariable=sum(ONLY(%Metrics))  does not work. The definition has to be ='sum(' & ONLY(%Metrics) & ')' and then it is converted to a value by using $() function. What is the logic here? I tried to merge the definition together as =$('sum(' & ONLY(%Metrics) & ')'). It does not work. Could you give me some explanations?

Thanks