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Infrastructure planning: Incomplete factor indexes produce unexpected scores

Technote (troubleshooting)


While assessing needs for municipal assets, you assign factor indexes for each driver factor. If the factor indexes do not account for degradation, the resulting driver scores are lower than might be expected.


Unexpectedly low driver scores are generated for some drivers during needs assessment analysis.


Score analysis validation ensures that factor indexes are defined for all factor values that exist in the database. However, factor values may change due to degradation.

Factor indexes must include factor values calculated based on the defined degradation. When factor indexes defined by the user for a particular driver factor do not account for degradation, then factor scores for assets having out-of-scope values are not calculated. 

Driver scores are calculated from weighted factor scores. When scores for degradation are missing, the resulting driver score will be disproportionately low.

Resolving the problem

Ensure that factor indexes cover all factor values for the selected asset class, including values after applying degradation.

Document information

More support for: IBM Intelligent City Planning and Operations

Software version: 1.6

Operating system(s): Linux, Windows

Reference #: 1647903

Modified date: 2013-09-12