I am new to ArcGIS and I am trying to create a choropleth map to display ratio values for different countries.
I believe that my basemap will need to have a country layer so that the shading of country polygons will be possible but I don't understand how to link this with my data.
Will the world topographic map have an attribute table for the country layer in which I can add a new column containing my ratio values or do I need to create and import an excel file contains this information? If I need to create an excel sheet how do I link this so that the country polygons fill to represent the ratio values?
I have found some useful tutorials to show how I can view layer properties and select quantities from the symbology tab however I don't understand have to get my data to this stage.
Please can someone point me in the right direction