Oldu,
I'd be interested in seeing the stats for more schools. Right now, your sample may not be representative, and it would be interesting to be able to tell if some NPC groups are better able to gage their likelihood of success when they expand to new campuses and/or are able to provide better assistance to their chapters to make sure they don't close.
If you are willing, maybe you could choose an expanded list of schools with a geographic and demographic mix that would be an accurate sample for the nation (and the relative number of chapters that each NPC has/has ever had). I suggest this seriously since you do seem to enjoy research and list making.
And then, we could revisit the results to look for the organizations that really have a strength in this area.
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