Iowa Leading Indicator Index Standardization Factors

The standardization factors are the inverse of the standard deviation of the month-to-month changes in each component of the Iowa Leading Indicator Index (ILII) over the reported period. These factors equalize the volatility of the contribution from each component and are normalized to one.

The month-to-month changes are based on 12-month backward moving averages for all components except the agricultural futures profits index, the Iowa stock market index, and yield spread. The yield spread and new orders index changes are simple arithmetic changes; month-to-month changes for the rest of the components are computed as symmetric percentage changes.
Standardization factors are updated annually in August.
Organization: State of Iowa
Organization URL: https://catalog.data.gov/organization/iowa
Last updated: 2026-05-15T09:09:38.183331+00:00
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