Report for a group of nodes

Hi, I have a group called Cameras, then subgroups with locations, for example, Miami, New York, etc, and each group has several devices (cameras) on it.

How can I get a table or graph report that says how many devices were/are down and up for a period of time?

Like

Miami

January 30th

Up    Down

200     5

February 28th

Up     Down

201      4

etc.

Does it make sense?

Thank you.