Disclosure risks

The most obvious risks are posed by the OA-OA flows

• However, there is little potential for attribute disclosure

• A simple headcount data set at this scale would allow modelling of coarser flows, but with little attribute disclosure risk

The ward-to-ward flows pose a smaller risk

• Proposed record-swapping based disclosure control can introduce enough noise to reduce the risk

The district-to-district flows pose no practical risk

• Statistical agencies should not be afraid of publishing detailed flow data at this level