Iowa Center for Evaluation & Research
DMC Resource Center

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Official data on DMC for Iowa may be found at the following link:

For access to NCJJ population data [click here].

Understanding DMC Matrices Using the Relative Rate Index

As part of the reauthorization of the Juvenile Justice and Delinquency Prevention Act (JJDP Act), the federal Office of Juvenile Justice and Delinquency Prevention (OJJDP) designed matrices states are required to submit with their annual JJDP Act formula grant application.

The matrices present major decision points and compare processing “rates” by race and ethnicity through the relative rate index. DMC previously focused on comparing “percentages” of minority youth at confinement with their representation in the general population (DRI or disproprotionality rate index). The "relative rate index" (RRI) is an improved way to compare rates which reduces statistical bias. If the processing rate for one race/ethnic category of youth is identical to that of another, the relative rate index is a "1." For a step-by-step explanation of the new method, see the power point click here. The DMC Resource Center encourages users of the matrices to examine the population based rate tab, examine each group and consider what an "acceptable rate" is in addition to the relative rate.

In 2010 the DMC Resource Center began an initiative to gather data on school suspensions, expulsions and arrests to help understand the connections and further understand the school to court "pipeline." Data from Iowa Department of Public Education can be found clicking here.

The DMC Resource Center previously worked with the Iowa Department of Human Services and the Casey Foundation on the Minority Youth and Families Initiative to reduce child welfare disproportionality. For Child Welfare rates (click here)









DMC Data in Selected Iowa Counties
DMC in Selected Iowa Counties Woodbury County Tama County Humboldt, Wright, and Hamilton Counties Scott County Muscatine County Polk County Johnson County Blackhawk County




DMC Quickfacts

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