I have a map of my state with county boundaries. What settings should I use to color the counties based on their area but only if its area falls in the bottom or top 25% of county area?
For example, if I have 100 counties, sort them by area then color the top 25 (25%) and bottom 25 (25%).
I found the Symbology tab (Layer properties) and tried various combinations under Quantities, all using the SHAPE.AREA value. I tried changing the Classification. None of the combinations seem correct or require much manual manipulation. For example, I created 10 classes but set the fill to None for all classes except the bottom and top two classes.
Which classification method should I use and what is the recommended approach to performing this task?