I am trying to make a map using US census data showing vacant housing to total housing on the same map. I came across the "multiple attributes" feature under the symbology tab and wondered if this is the way to go and if so how to use it? Ive only been able to get one type of symbol, the gradient feature to appear. Thanks for the help!
The multiple attributes feature under symbology is indeed the way to go. If you select the two categories that you want to use to colour and scale your symbols in the value fields section and then select
You can also manually style individual value pairs by double clicking on the symbol beside the value pair and selecting your preferred style.
I did this for some sample data I created and got results like this:
Some more help can be found in the ArcGIS documentation which covers more complex cases.
The Multiple Attributes feature might end up with too many symbols/colors to be useful if you're mapping a large area. Another technique would be to apply colors based on the percentage of vacant houses in each census polygon (tract, block area, block, etc. - whichever one you're using).
The end result will be a map with one color in each polygon that quickly illustrates how much of the total housing in each polygon is vacant.