Checking the integrity of the district plan

Esri Redistricting contains a set of quality checks you can run against your redistricting plan. The quality checks determine the integrity of the district plan and can help you identify districts that do not meet defined standards.

There are a number of data quality checks contained in Esri Redistricting including:

• Dual Assignment Check verifies that a geography is only assigned to one district.
• Population Summary Check ensures that the total population count in all districts is equal to the whole area.
• District Count Check ensures that all districts have at least one assignment.
• Maximum Deviation Check verifies that each district deviation does not exceed the maximum deviation from the target deviation.
• Overall Range Check validates that each district is within the overall deviation range, such that the total over or under from the target deviation across all districts does not exceed the maximum deviation.
• Null Assignment Check ensures that there are no unassigned geographies in your district plan.
• Connectivity Check ensures that all parts of a district are connected with the rest of the district.

The integrity tests run through a series of checks to ensure the district plan adheres to defined standards. If an integrity check fails, you can click the Details or Zoom To button for additional information.

1. On the Review ribbon, click Check Integrity.

   The Integrity Tests dialog box launches. Esri Redistricting automatically runs the connectivity check.

The Integrity Tests dialog box displays results for each of the tests performed.

• A green check mark indicates the district plan passed the integrity test.
• A red X indicates the district plan failed the integrity test.

Note:

When a test fails, you can click Details to view more information about why a check did not pass.

When the connectivity check fails, clicking Details displays the Discontiguous Districts dialog box. On the Discontiguous Districts dialog box, highlight a district that is discontiguous and use the Previous Part and Next Part buttons to navigate the map to the discontiguous parts.



When the maximum deviation check fails, clicking Details displays the Maximum Deviation Details dialog box. Here, you will see the total and ideal population values, the difference, and the allowable deviation.

2. Click OK to close the Integrity Tests dialog box.