We're conducting 12 year historical analysis on a 15 state study area. For simplicity and consistency, we've used the 15 state study area for each of the 12 years. But we're starting to question that strategy because in many years some states have no projects. In fact, one of the bigger states only has a project in one of the 12 years. But we're concerned that by having 12 different study area compositions aggregation of data will be suspect, and certainly explaining it will be more complex. Your thoughts?
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