IMPLAN Pro: Aggregating Results Reports

Introduction:

If you have Industry or Sector level detail with which to Model your impacts but you would like to produce simplified, easy to read results, aggregating the Result Interface after the Model is run is a way to maintain the accuracy of the Model's Multiplier specificity and integrity, while still providing you audience with a simplified set of results to interpret. This article explains that process for IMPLAN Pro.

Detailed Information:

Aggregating a Model can create issues of Aggregation Bias, creating Multipliers and production functions that no longer accurately represent the Industry impacts you are trying to model, but instead representing weighted averages of the combined Industries that can vary drastically from the Industry Sectors of which they are comprised.

To avoid Aggregation Bias, you may want to avoid aggregating a Model and aggregate only the results produced by the Model.

When you only need to report on certain Sectors or groups of Sectors or your audience is better addressed by rolled up Industry categories, you can condense reports into aggregate formats, while maintaining the unique Industry production functions and their resultant Multiplier integrity.

Usage:

To get accurate results in combination with a simplified report, you will want to run your impacts on an unaggregated model and then aggregate the Detailed Results into your specified format.

Aggregation Bias is avoided in this method because the aggregated result values are simple summations of the final numbers, thus there is no loss of underlying data integrity.

Aggregation Options

There are four (4 ) aggregation schemes available for your results: one default and three user scheme options.

1. 1.  This is a button available in the Detail Results> Options menu. When selected, the results will aggregate down to a standard eight Sector scheme.
   2.  will apply one of the remaining 3 options to your results.

1. 1. 1. 2-Digit NAICS - Applies a standard 2-digit NAICS scheme to your results.
      2. 3-Digit NAICS - Applies a standard 3-digit NAICS scheme to your results.
      3. Custom Scheme - Create and apply your own aggregation scheme to your results.

To activate the  button in the Options menu, you will need to have one of the User Scheme's selected in the Aggregation Builder.

• • • NAICS schema can be selected by using the  function from the library.
    • Previously created Custom Schemes can be saved using the  function for later use via import.
  • • Instructions on creating Custom Schema are located here.
      
      

Using the Functions of the Options>Aggregation Menu

From the Standard Bar Options menu, select  to open the Aggregation Builder window.

 or create the scheme you would like to apply to your results.

the Aggregation Builder.

NOTE:

DO NOT select .

 the Aggregation Builder.

If you do select , select in the warning screen.

Aggregating Your Results

In the Detail Results screen, select either:

• • • Options>  or
    • Options> .

The scheme selected in the Aggregation Builder will be applied to your results.

To return to the full 536 view, simply click in Options menu.

Related Topics:

Aggregation Builder

Creating Custom Schemas