The biggest challenge for me was to follow directions first and experiment later...it cost me sooo much time. It seemed that that I found all of the places to cause the map system to do something different than I intended because a box was inadvertently selected or deselected...
I think two issues for real world data sets would be completeness, and accuracy. It would make this kind of analysis so difficult the data was was erroneous or lumpy.
For what is worth - now is the time to stumble and learn and not get upset - you made the attempt and still have time to upgrade - improve - or destroy - bottem line have fun and push your abilities to be creative yet constructive in presenting "data"
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