Percent Change

Summary

Calculates percent change for polygon or line features that correspond with point features representing two comparison time periods.

Usage

  • Generally, Input Current Period Point Features and Input Previous Period Point Features feature layers will be created by performing a date and time selection on a larger dataset and saving the selection to a new layer.
  • Generates a Current_Count, Previous_Count, Difference, and Percent Change fields in the output feature class.
    • Current_Count—The number of Input Current Period Point Features that are coincident with the Input Comparison Polygon or Line Features.
    • Previous_Count—The number of Input Previous Period Point Features that are coincident with the Input Comparison Polygon or Line Features.
    • Difference—The difference between the Current_Count and the Previous_Count fields.
    • Percent Change—Calculated using the following formula: ((C - P) / P) * 100 where C is the current count and P is the previous count. If the Current_Count is 0 then the percent change value is null. When the percent change value is null these features are designated as no percentage in output symbology classification.
  • When a line feature class is used in the Input Comparison Polygon or Line Features parameter a Standard or Advanced License is required.

Syntax

PercentChange_crime (Input_Current_Period_Point_Features, Input_Previous_Period_Point_Features, Input_Comparison_Polygon_or_Line_Features, Output_Feature_Class, {Search_Radius})

Parameter Explanation Data Type
Input Current Period Point Features

Point features filtered to the most recent comparison time period.

Example: Crimes from the last 14 days.

Feature Layer
Input Previous Period Point Features

Point features filtered to the time period immediately preceding the current period. This time period should be of equal length to the current period.

Example: If the current period contained features from the date range of January 15 - 28, the previous period would contain features from the date range of January 1-14.

Feature Layer
Input Comparison Polygon or Line Features

Coincident polygon or line features by which comparison time periods will be counted and compared.

Example: Police Districts, City Council Districts, Road Centerlines and so on.

Feature Layer
Output Feature Class Output polygon or line feature class containing difference counts and percent change calculations for the time period comparison. Feature Class
Search Radius (Optional) Maximum linear distance from the comparison line features that a point feature will be considered coincident. Linear Unit

Licensing information

  • ArcGIS Desktop Basic: Limited
  • ArcGIS Desktop Standard: Yes
  • ArcGIS Desktop Advanced: Yes
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