| • Click on the Analyze tab, select to Add Field(s) By Math Operation, and complete the form as follows:
• Next, double check to see that the new % Negro Population field has been added -
- select the Southern States 1900 layer
- click on the table icon (
 )
- move the slider at the bottom of the screen all of the way to the right to see the new field:
• Finally, click on the Visualize tab and double click on the Southern States - 1900 layer to bring up the Edit Appearance window. You can choose the Colorscheme you want to use. Enter 5 as the Number of Fill Colors and select to Classify By: Quantiles. This will give you five groups with approximately the same number of states per group:
• Click the Apply button and Close the window to view your data map.
|
• Right click the Southern States 1900 layer in the table of contents and select Properties....
• Click on the Symbology tab and select Quantities.
• In the Fields pane select NEGRO as the Value andPOP1900 as the Normalization value.
The result is the desired division. It is said to be a normalized value because we now have a rate that is not affected by the size of the states.
• In the Classification pane click the Classify button. You will see a new window. Select to classify by Quantiles and 5 classes as pictured below:
This will give you five groups with approximately the same number of states per group.
• Click OK
• You can define your own labels to make the map easier to read by editing the values in the Labels column:
• Click OK again to leave the Properties window and view your new data map.
|
) and/or pan (
) to position the map image as desired.
) and/or pan (
) to position the map image as desired.
